From 109eee98d145c32d9bccb12a1c2a125c64a874f1 Mon Sep 17 00:00:00 2001
From: Eric Earl <eric.earl@nih.gov>
Date: Fri, 15 Apr 2022 13:34:47 -0700
Subject: [PATCH 1/2] Conform schema/rules for sidecars and tabular_data

Did my best to conform all these rules to the sprint standard decisions.
---
 src/schema/rules/sidecars/asl.yaml            | 144 +++++-----
 src/schema/rules/sidecars/asl_validation.yaml | 269 ++++++++++--------
 src/schema/rules/sidecars/beh.yaml            |  16 +-
 src/schema/rules/sidecars/continuous.yaml     |  16 +-
 src/schema/rules/sidecars/dwi.yaml            |  12 +-
 src/schema/rules/sidecars/eeg.yaml            | 110 +++----
 src/schema/rules/sidecars/entities.yaml       |  26 +-
 .../rules/sidecars/events_validation.yaml     |  13 +-
 src/schema/rules/sidecars/fmap.yaml           |  22 +-
 .../rules/sidecars/fmap_validation.yaml       |  18 +-
 src/schema/rules/sidecars/func.yaml           |  66 ++---
 src/schema/rules/sidecars/ieeg.yaml           |  95 ++++---
 src/schema/rules/sidecars/meg.yaml            | 149 +++++-----
 src/schema/rules/sidecars/micr.yaml           |  70 ++---
 src/schema/rules/sidecars/mri.yaml            | 184 ++++++------
 src/schema/rules/sidecars/pet.yaml            | 160 +++++------
 src/schema/rules/tabular_data/eeg.yaml        |  47 +--
 src/schema/rules/tabular_data/ieeg.yaml       |  59 ++--
 src/schema/rules/tabular_data/meg.yaml        |  27 +-
 src/schema/rules/tabular_data/pet.yaml        |  28 +-
 20 files changed, 798 insertions(+), 733 deletions(-)

diff --git a/src/schema/rules/sidecars/asl.yaml b/src/schema/rules/sidecars/asl.yaml
index 81c10c6846..2d4aa50065 100644
--- a/src/schema/rules/sidecars/asl.yaml
+++ b/src/schema/rules/sidecars/asl.yaml
@@ -13,28 +13,29 @@ MRIASLTextOnly:
     - datatype == "perf"
     - suffix == "asl"
     fields:
-        MagneticFieldStrength: REQUIRED
-        MRAcquisitionType: REQUIRED
-        EchoTime: REQUIRED
+        MagneticFieldStrength: required
+        MRAcquisitionType: required
+        EchoTime: required
         SliceTiming:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `MRAcquisitionType` is defined as `2D`
-        RepetitionTimePreparation: REQUIRED
+            level: recommended
+            level_addendum: required if `MRAcquisitionType` is defined as `2D`
+        RepetitionTimePreparation: required
         FlipAngle:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `LookLocker` is `true`
+            level: recommended
+            level_addendum: required if `LookLocker` is `true`
 
 MRIASLTextOnlySliceTiming:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "MRAcquisitionType"
     - sidecar.MRAcquisitionType == "2D"
     fields:
         SliceTiming:
-            level: REQUIRED
+            level: required
             issue:
-                name: SLICE_TIMING_NOT_DEFINED_2D_ASL
+                code: SLICE_TIMING_NOT_DEFINED_2D_ASL
                 message: |
                     You should define `SliceTiming` for this file, because `SequenceType` is sets
                     to a 2D sequence. `SliceTiming` is the time at which each slice was
@@ -44,7 +45,7 @@ MRIASLTextOnlySliceTiming:
                     of volume acquisition. The list goes through the slices along the slice
                     axis in the slice encoding dimension (see below). Note that to ensure the
                     proper interpretation of the `SliceTiming` field, it is important to check
-                    if the OPTIONAL `SliceEncodingDirection` exists. In particular, if
+                    if the optional `SliceEncodingDirection` exists. In particular, if
                     `SliceEncodingDirection` is negative, the entries in `SliceTiming` are
                     defined in reverse order with respect to the slice axis, such that the
                     final entry in the `SliceTiming` list is the time of acquisition of slice 0.
@@ -55,12 +56,13 @@ MRIASLTextOnlyFlipAngle:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "LookLocker"
     - sidecar.LookLocker == true
     fields:
         FlipAngle:
-            level: REQUIRED
+            level: required
             issue:
-                name: LOOK_LOCKER_FLIP_ANGLE_MISSING
+                code: LOOK_LOCKER_FLIP_ANGLE_MISSING
                 message: |
                     You should define `FlipAngle` for this file, in case of a
                     LookLocker acquisition. `FlipAngle` is the flip angle (FA)
@@ -81,42 +83,43 @@ MRIASLCommonMetadataFields:
     - datatype == "perf"
     - suffix == "asl"
     fields:
-        ArterialSpinLabelingType: REQUIRED
-        PostLabelingDelay: REQUIRED
-        BackgroundSuppression: REQUIRED
-        M0Type: REQUIRED
-        TotalAcquiredPairs: REQUIRED
-        VascularCrushing: RECOMMENDED
-        AcquisitionVoxelSize: RECOMMENDED
+        ArterialSpinLabelingType: required
+        PostLabelingDelay: required
+        BackgroundSuppression: required
+        M0Type: required
+        TotalAcquiredPairs: required
+        VascularCrushing: recommended
+        AcquisitionVoxelSize: recommended
         M0Estimate:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `M0Type` is `Estimate`
+            level: optional
+            level_addendum: required if `M0Type` is `Estimate`
         BackgroundSuppressionNumberPulses:
-            level: OPTIONAL
-            level_addendum: RECOMMENDED if `BackgroundSuppression` is `true`
+            level: optional
+            level_addendum: recommended if `BackgroundSuppression` is `true`
         BackgroundSuppressionPulseTime:
-            level: OPTIONAL
-            level_addendum: RECOMMENDED if `BackgroundSuppression` is `true`
+            level: optional
+            level_addendum: recommended if `BackgroundSuppression` is `true`
         VascularCrushingVENC:
-            level: OPTIONAL
-            level_addendum: RECOMMENDED if `VascularCrushing` is `true`
-        LabelingOrientation: RECOMMENDED
-        LabelingDistance: RECOMMENDED
-        LabelingLocationDescription: RECOMMENDED
-        LookLocker: OPTIONAL
-        LabelingEfficiency: OPTIONAL
+            level: optional
+            level_addendum: recommended if `VascularCrushing` is `true`
+        LabelingOrientation: recommended
+        LabelingDistance: recommended
+        LabelingLocationDescription: recommended
+        LookLocker: optional
+        LabelingEfficiency: optional
 
 MRIASLCommonMetadataFieldsM0Type:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "M0Type"
     - sidecar.M0Type == "Estimate"
     fields:
         M0Estimate:
-            level: REQUIRED
+            level: required
             issue:
-                name: M0ESTIMATE_NOT_DEFINED
+                code: M0ESTIMATE_NOT_DEFINED
                 message: |
                     You must define `M0Estimate` for this file, because `M0Type` is set to
                     'Estimate'. `M0Estimate` is a single numerical whole-brain M0 value
@@ -128,82 +131,90 @@ MRIASLCommonMetadataFieldsBackgroundSuppression:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "BackgroundSuppression"
     - sidecar.BackgroundSuppression == true
     fields:
-        BackgroundSuppressionNumberPulses: RECOMMENDED
-        BackgroundSuppressionPulseTime: RECOMMENDED
+        BackgroundSuppressionNumberPulses: recommended
+        BackgroundSuppressionPulseTime: recommended
 
 MRIASLCommonMetadataFieldsVascularCrushing:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "VascularCrushing"
     - sidecar.VascularCrushing == true
     fields:
-        VascularCrushingVENC: RECOMMENDED
+        VascularCrushingVENC: recommended
 
 MRIASLPCASLSpecific:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "ArterialSpinLabelingType"
     - sidecar.ArterialSpinLabelingType in ["CASL", "PCASL"]
     fields:
-        LabelingDuration: REQUIRED
-        LabelingPulseAverageGradient: RECOMMENDED
-        LabelingPulseMaximumGradient: RECOMMENDED
-        LabelingPulseAverageB1: RECOMMENDED
-        LabelingPulseDuration: RECOMMENDED
-        LabelingPulseFlipAngle: RECOMMENDED
-        LabelingPulseInterval: RECOMMENDED
+        LabelingDuration: required
+        LabelingPulseAverageGradient: recommended
+        LabelingPulseMaximumGradient: recommended
+        LabelingPulseAverageB1: recommended
+        LabelingPulseDuration: recommended
+        LabelingPulseFlipAngle: recommended
+        LabelingPulseInterval: recommended
 
 MRIASLPCASLSpecific2:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "ArterialSpinLabelingType"
     - sidecar.ArterialSpinLabelingType == "PCASL"
     fields:
-        PCASLType: RECOMMENDED
+        PCASLType: recommended
 
 MRIASLCASLSpecific:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "ArterialSpinLabelingType"
     - sidecar.ArterialSpinLabelingType == "CASL"
     fields:
-        CASLType: RECOMMENDED
+        CASLType: recommended
 
 MRIASLPASLSpecific:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "ArterialSpinLabelingType"
     - sidecar.ArterialSpinLabelingType == "PASL"
     fields:
-        BolusCutOffFlag: REQUIRED
-        PASLType: RECOMMENDED
-        LabelingSlabThickness: RECOMMENDED
+        BolusCutOffFlag: required
+        PASLType: recommended
+        LabelingSlabThickness: recommended
         BolusCutOffDelayTime:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `BolusCutOffFlag` is `true`
+            level: optional
+            level_addendum: required if `BolusCutOffFlag` is `true`
         BolusCutOffTechnique:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `BolusCutOffFlag` is `true`
+            level: optional
+            level_addendum: required if `BolusCutOffFlag` is `true`
 
 MRIASLPASLSpecificBolusCutOffFlag:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "asl"
+    - sidecar contains "ArterialSpinLabelingType"
     - sidecar.ArterialSpinLabelingType == "PASL"
+    - sidecar contains "BolusCutOffFlag"
     - sidecar.BolusCutOffFlag == true
     fields:
         BolusCutOffDelayTime:
-            level: REQUIRED
+            level: required
             issue:
-                name: PASL_BOLUS_CUT_OFF_DELAY_TIME
+                code: PASL_BOLUS_CUT_OFF_DELAY_TIME
                 message: |
                     It is required to define 'BolusCutOffDelayTime' for this file,
                     when 'BolusCutOffFlag' is set to true. 'BolusCutOffDelayTime' is
@@ -215,9 +226,9 @@ MRIASLPASLSpecificBolusCutOffFlag:
                     bolus cut-off saturation pulses are provided. Based on DICOM Tag
                     0018,925F ASL Bolus Cut-off Delay Time.
         BolusCutOffTechnique:
-            level: REQUIRED
+            level: required
             issue:
-                name: PASL_BOLUS_CUT_OFF_TECHINIQUE
+                code: PASL_BOLUS_CUT_OFF_TECHINIQUE
                 message: |
                     It is required to define `BolusCutOffTechnique` for this file,
                     when `BolusCutOffFlag` is set to `true`. `BolusCutOffTechnique`,
@@ -232,23 +243,24 @@ MRIASLM0ScanTextOnly:
     - datatype == "perf"
     - suffix == "m0scan"
     fields:
-        EchoTime: REQUIRED
-        RepetitionTimePreparation: REQUIRED
+        EchoTime: required
+        RepetitionTimePreparation: required
         FlipAngle:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `LookLocker` is `true`
+            level: recommended
+            level_addendum: required if `LookLocker` is `true`
 
 MRIASLM0ScanTextOnlyFlipAngle:
     selectors:
     - modality == "MRI"
     - datatype == "perf"
     - suffix == "m0scan"
+    - sidecar contains "LookLocker"
     - sidecar.LookLocker == true
     fields:
         FlipAngle:
-            level: REQUIRED
+            level: required
             issue:
-                name: LOOK_LOCKER_FLIP_ANGLE_MISSING
+                code: LOOK_LOCKER_FLIP_ANGLE_MISSING
                 message: |
                     You should define `FlipAngle` for this file, in case of a LookLocker
                     acquisition. `FlipAngle` is the flip angle (FA) for the acquisition,
@@ -267,7 +279,7 @@ MRIASLM0Scan:
     - suffix == "m0scan"
     fields:
         IntendedFor:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 This is used to refer to the ASL time series for which the `*_m0scan.nii[.gz]` is intended.
-        AcquisitionVoxelSize: RECOMMENDED
+        AcquisitionVoxelSize: recommended
diff --git a/src/schema/rules/sidecars/asl_validation.yaml b/src/schema/rules/sidecars/asl_validation.yaml
index 392b9bf7db..1ed38e1d90 100644
--- a/src/schema/rules/sidecars/asl_validation.yaml
+++ b/src/schema/rules/sidecars/asl_validation.yaml
@@ -3,19 +3,20 @@
 
 # 157
 ASLLabelingDurationNiftiLength:
-    code: LABELING_DURATION_LENGTH_NOT_MATCHING_NIFTI
-    description: |
-        The number of values for 'LabelingDuration' for this file does not match the 4th dimension of the NIfTI header.
-        'LabelingDuration' is the total duration of the labeling pulse train, in seconds,
-        corresponding to the temporal width of the labeling bolus for `(P)CASL`.
-        In case all control-label volumes (or deltam or CBF) have the same `LabelingDuration`, a scalar must be
-        specified.
-        In case the control-label volumes (or deltam or cbf) have a different `LabelingDuration`,
-        an array of numbers must be specified, for which any `m0scan` in the timeseries has a `LabelingDuration` of
-        zero.
-        In case an array of numbers is provided, its length should be equal to the number of volumes specified in
-        `*_aslcontext.tsv`. Corresponds to DICOM Tag 0018,9258 `ASL Pulse Train Duration`.
-    level: error
+    issue:
+        code: LABELING_DURATION_LENGTH_NOT_MATCHING_NIFTI
+        message: |
+            The number of values for 'LabelingDuration' for this file does not match the 4th dimension of the NIfTI header.
+            'LabelingDuration' is the total duration of the labeling pulse train, in seconds,
+            corresponding to the temporal width of the labeling bolus for `(P)CASL`.
+            In case all control-label volumes (or deltam or CBF) have the same `LabelingDuration`, a scalar must be
+            specified.
+            In case the control-label volumes (or deltam or cbf) have a different `LabelingDuration`,
+            an array of numbers must be specified, for which any `m0scan` in the timeseries has a `LabelingDuration` of
+            zero.
+            In case an array of numbers is provided, its length should be equal to the number of volumes specified in
+            `*_aslcontext.tsv`. Corresponds to DICOM Tag 0018,9258 `ASL Pulse Train Duration`.
+        level: error
     selectors:
     - suffix == "asl"
     - sidecar contains "LabelingDuration"
@@ -25,11 +26,12 @@ ASLLabelingDurationNiftiLength:
 
 # 165
 ASLContextConsistent:
-    code: ASLCONTEXT_TSV_NOT_CONSISTENT
-    description: |
-        The number of volumes in the '*_aslcontext.tsv' for this file does not match the number of
-        values in the NIfTI header.
-    level: error
+    issue:
+        code: ASLCONTEXT_TSV_NOT_CONSISTENT
+        message: |
+            The number of volumes in the '*_aslcontext.tsv' for this file does not match the number of
+            values in the NIfTI header.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -38,16 +40,17 @@ ASLContextConsistent:
 
 # 168
 ASLFlipAngleNiftiLength:
-    code: FLIP_ANGLE_NOT_MATCHING_NIFTI
-    description: |
-        The number of values for 'FlipAngle' for this file does not match the 4th dimension of the NIfTI header.
-        'FlipAngle' is the flip angle (FA) for the acquisition, specified in degrees.
-        Corresponds to: DICOM Tag 0018, 1314 `Flip Angle`.
-        The data type number may apply to files from any MRI modality concerned with a single value for this field,
-        or to the files in a file collection where the value of this field is iterated using the flip entity.
-        The data type array provides a value for each volume in a 4D dataset and should only be used when the
-        volume timing is critical for interpretation of the data, such as in ASL or variable flip angle fMRI sequences.
-    level: error
+    issue:
+        code: FLIP_ANGLE_NOT_MATCHING_NIFTI
+        message: |
+            The number of values for 'FlipAngle' for this file does not match the 4th dimension of the NIfTI header.
+            'FlipAngle' is the flip angle (FA) for the acquisition, specified in degrees.
+            Corresponds to: DICOM Tag 0018, 1314 `Flip Angle`.
+            The data type number may apply to files from any MRI modality concerned with a single value for this field,
+            or to the files in a file collection where the value of this field is iterated using the flip entity.
+            The data type array provides a value for each volume in a 4D dataset and should only be used when the
+            volume timing is critical for interpretation of the data, such as in ASL or variable flip angle fMRI sequences.
+        level: error
     selectors:
     - suffix == "asl"
     - sidecar contains "FlipAngle"
@@ -57,17 +60,18 @@ ASLFlipAngleNiftiLength:
 
 # 172
 ASLFlipAngleASLContextLength:
-    code: FLIP_ANGLE_NOT_MATCHING_ASLCONTEXT_TSV
-    description: |
-       The number of values for 'FlipAngle' for this file does not match the number of volumes in the
-       'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-       'FlipAngle' is the flip angle (FA) for the acquisition, specified in degrees.
-       Corresponds to: DICOM Tag 0018, 1314 `Flip Angle`.
-       The data type number may apply to files from any MRI modality concerned with a single value for this field,
-       or to the files in a file collection where the value of this field is iterated using the flip entity.
-       The data type array provides a value for each volume in a 4D dataset and should only be used when the volume
-       timing is critical for interpretation of the data, such as in ASL or variable flip angle fMRI sequences.
-    level: error
+    issue:
+        code: FLIP_ANGLE_NOT_MATCHING_ASLCONTEXT_TSV
+        message: |
+            The number of values for 'FlipAngle' for this file does not match the number of volumes in the
+            'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'FlipAngle' is the flip angle (FA) for the acquisition, specified in degrees.
+            Corresponds to: DICOM Tag 0018, 1314 `Flip Angle`.
+            The data type number may apply to files from any MRI modality concerned with a single value for this field,
+            or to the files in a file collection where the value of this field is iterated using the flip entity.
+            The data type array provides a value for each volume in a 4D dataset and should only be used when the volume
+            timing is critical for interpretation of the data, such as in ASL or variable flip angle fMRI sequences.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -78,19 +82,20 @@ ASLFlipAngleASLContextLength:
 
 # 173
 ASLPostLabelingDelayNiftiLength:
-    code: POST_LABELING_DELAY_NOT_MATCHING_NIFTI
-    description: |
-        The number of values for 'PostLabelingDelay' for this file does not match the 4th dimension of the NIfTI
-        header.
-        'PostLabelingDelay' is the time, in seconds, after the end of the labeling (for (P)CASL) or middle of the
-        labeling pulse (for PASL) until the middle of the excitation pulse applied to the imaging slab
-        (for 3D acquisition) or first slice (for 2D acquisition).
-        Can be a number (for a single-PLD time series) or an array of numbers (for multi-PLD and Look-Locker).
-        In the latter case, the array of numbers contains the PLD of each volume (i.e. each 'control' and 'label')
-        in the acquisition order. Any image within the time-series without a PLD (e.g. an 'm0scan') is indicated by a
-        zero.
-        Based on DICOM Tags 0018,9079 Inversion Times and 0018,0082 InversionTime.
-    level: error
+    issue:
+        code: POST_LABELING_DELAY_NOT_MATCHING_NIFTI
+        message: |
+            The number of values for 'PostLabelingDelay' for this file does not match the 4th dimension of the NIfTI
+            header.
+            'PostLabelingDelay' is the time, in seconds, after the end of the labeling (for (P)CASL) or middle of the
+            labeling pulse (for PASL) until the middle of the excitation pulse applied to the imaging slab
+            (for 3D acquisition) or first slice (for 2D acquisition).
+            Can be a number (for a single-PLD time series) or an array of numbers (for multi-PLD and Look-Locker).
+            In the latter case, the array of numbers contains the PLD of each volume (i.e. each 'control' and 'label')
+            in the acquisition order. Any image within the time-series without a PLD (e.g. an 'm0scan') is indicated by a
+            zero.
+            Based on DICOM Tags 0018,9079 Inversion Times and 0018,0082 InversionTime.
+        level: error
     selectors:
     - suffix == "asl"
     - sidecar contains "PostLabelingDelay"
@@ -100,19 +105,20 @@ ASLPostLabelingDelayNiftiLength:
 
 # 174
 ASLPostLabelingDelayASLContextLength:
-    code: POST_LABELING_DELAY_NOT_MATCHING_ASLCONTEXT_TSV
-    description: |
-        The number of values for 'PostLabelingDelay' for this file does not match the number of volumes
-        in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-        'PostLabelingDelay' is the time, in seconds, after the end of the labeling (for (P)CASL) or
-        middle of the labeling pulse (for PASL) until the middle of the excitation pulse applied to
-        the imaging slab (for 3D acquisition) or first slice (for 2D acquisition).
-        Can be a number (for a single-PLD time series) or an array of numbers (for multi-PLD and Look-Locker).
-        In the latter case, the array of numbers contains the PLD of each volume (i.e. each 'control' and 'label')
-        in the acquisition order.
-        Any image within the time-series without a PLD (e.g. an 'm0scan') is indicated by a zero.
-        Based on DICOM Tags 0018,9079 Inversion Times and 0018,0082 InversionTime.
-    level: error
+    issue:
+        code: POST_LABELING_DELAY_NOT_MATCHING_ASLCONTEXT_TSV
+        message: |
+            The number of values for 'PostLabelingDelay' for this file does not match the number of volumes
+            in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'PostLabelingDelay' is the time, in seconds, after the end of the labeling (for (P)CASL) or
+            middle of the labeling pulse (for PASL) until the middle of the excitation pulse applied to
+            the imaging slab (for 3D acquisition) or first slice (for 2D acquisition).
+            Can be a number (for a single-PLD time series) or an array of numbers (for multi-PLD and Look-Locker).
+            In the latter case, the array of numbers contains the PLD of each volume (i.e. each 'control' and 'label')
+            in the acquisition order.
+            Any image within the time-series without a PLD (e.g. an 'm0scan') is indicated by a zero.
+            Based on DICOM Tags 0018,9079 Inversion Times and 0018,0082 InversionTime.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -123,21 +129,22 @@ ASLPostLabelingDelayASLContextLength:
 
 # 175
 ASLLabelingDurationASLContextLength:
-    code: LABELLING_DURATION_NOT_MATCHING_ASLCONTEXT_TSV
-    description: |
-        The number of values for 'LabelingDuration' for this file does not match the number of volumes
-        in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-        'LabelingDuration' is the total duration of the labeling pulse train, in seconds,
-        corresponding to the temporal width of the labeling bolus for `(P)CASL`.
-        In case all control-label volumes (or deltam or CBF) have the same `LabelingDuration`,
-        a scalar must be specified.
-        In case the control-label volumes (or deltam or cbf) have a different `LabelingDuration`,
-        an array of numbers must be specified, for which any `m0scan` in the timeseries has a
-        `LabelingDuration` of zero.
-        In case an array of numbers is provided, its length should be equal to the number of volumes
-        specified in `*_aslcontext.tsv`.
-        Corresponds to DICOM Tag 0018,9258 `ASL Pulse Train Duration`.
-    level: error
+    issue:
+        code: LABELLING_DURATION_NOT_MATCHING_ASLCONTEXT_TSV
+        message: |
+            The number of values for 'LabelingDuration' for this file does not match the number of volumes
+            in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'LabelingDuration' is the total duration of the labeling pulse train, in seconds,
+            corresponding to the temporal width of the labeling bolus for `(P)CASL`.
+            In case all control-label volumes (or deltam or CBF) have the same `LabelingDuration`,
+            a scalar must be specified.
+            In case the control-label volumes (or deltam or cbf) have a different `LabelingDuration`,
+            an array of numbers must be specified, for which any `m0scan` in the timeseries has a
+            `LabelingDuration` of zero.
+            In case an array of numbers is provided, its length should be equal to the number of volumes
+            specified in `*_aslcontext.tsv`.
+            Corresponds to DICOM Tag 0018,9258 `ASL Pulse Train Duration`.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -148,16 +155,17 @@ ASLLabelingDurationASLContextLength:
 
 # 177
 ASLRepetitionTimePreparationASLContextLength:
-    code: REPETITIONTIMEPREPARATION_NOT_MATCHING_ASLCONTEXT_TSV
-    description: |
-        The number of values of 'RepetitionTimePreparation' for this file does not match the number of
-        volumes in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-        'RepetitionTimePreparation' is the interval, in seconds, that it takes a preparation pulse block to
-        re-appear at the beginning of the succeeding (essentially identical) pulse sequence block.
-        The data type number may apply to files from any MRI modality concerned with a single value for this field.
-        The data type array provides a value for each volume in a 4D dataset and should only be used when the
-        volume timing is critical for interpretation of the data, such as in ASL.
-    level: error
+    issue:
+        code: REPETITIONTIMEPREPARATION_NOT_MATCHING_ASLCONTEXT_TSV
+        message: |
+            The number of values of 'RepetitionTimePreparation' for this file does not match the number of
+            volumes in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'RepetitionTimePreparation' is the interval, in seconds, that it takes a preparation pulse block to
+            re-appear at the beginning of the succeeding (essentially identical) pulse sequence block.
+            The data type number may apply to files from any MRI modality concerned with a single value for this field.
+            The data type array provides a value for each volume in a 4D dataset and should only be used when the
+            volume timing is critical for interpretation of the data, such as in ASL.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -168,13 +176,14 @@ ASLRepetitionTimePreparationASLContextLength:
 
 # 180
 ASLBackgroundSuppressionNumberPulses:
-    code: BACKGROUND_SUPPRESSION_PULSE_NUMBER_NOT_CONSISTENT
-    description: |
-        The 'BackgroundSuppressionNumberPulses' field is not consistent with the length of
-        'BackgroundSuppressionPulseTime'.
-        'BackgroundSuppressionNumberPulses' is the number of background suppression pulses used.
-        Note that this excludes any effect of background suppression pulses applied before the labeling.
-    level: warning
+    issue:
+        code: BACKGROUND_SUPPRESSION_PULSE_NUMBER_NOT_CONSISTENT
+        message: |
+            The 'BackgroundSuppressionNumberPulses' field is not consistent with the length of
+            'BackgroundSuppressionPulseTime'.
+            'BackgroundSuppressionNumberPulses' is the number of background suppression pulses used.
+            Note that this excludes any effect of background suppression pulses applied before the labeling.
+        level: warning
     selectors:
     - suffix == "asl"
     - sidecar contains "BackgroundSuppressionNumberPulses"
@@ -185,13 +194,14 @@ ASLBackgroundSuppressionNumberPulses:
 
 # 181
 ASLTotalAcquiredVolumesASLContextLength:
-    code: TOTAL_ACQUIRED_VOLUMES_NOT_CONSISTENT
-    description: |
-        The number of values for 'TotalAcquiredVolumes' for this file does not match number of
-        volumes in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-        'TotalAcquiredVolumes' is the original number of 3D volumes acquired for each volume defined in the
-        'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-    level: warning
+    issue:
+        code: TOTAL_ACQUIRED_VOLUMES_NOT_CONSISTENT
+        message: |
+            The number of values for 'TotalAcquiredVolumes' for this file does not match number of
+            volumes in the 'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'TotalAcquiredVolumes' is the original number of 3D volumes acquired for each volume defined in the
+            'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+        level: warning
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -201,12 +211,13 @@ ASLTotalAcquiredVolumesASLContextLength:
 
 # 196
 ASLEchoTimeASLContextLength:
-    code: ECHO_TIME_NOT_CONSISTENT
-    description: |
-        The number of values for 'EchoTime' for this file does not match number of volumes in the
-        'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
-        'EchoTime' is the echo time (TE) for the acquisition, specified in seconds.
-    level: warning
+    issue:
+        code: ECHO_TIME_NOT_CONSISTENT
+        message: |
+            The number of values for 'EchoTime' for this file does not match number of volumes in the
+            'sub-<label>[_ses-<label>][_acq-<label>][_rec-<label>][_run-<index>]_aslcontext.tsv'.
+            'EchoTime' is the echo time (TE) for the acquisition, specified in seconds.
+        level: warning
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
@@ -217,43 +228,49 @@ ASLEchoTimeASLContextLength:
 
 # 198
 ASLM0TypeAbsentScan:
-    code: M0Type_SET_INCORRECTLY_TO_ABSENT
-    description: |
-        You defined M0Type as 'absent' while including a separate '*_m0scan.nii[.gz]' and
-        '*_m0scan.json', or defining the 'M0Estimate' field.
-        This is not allowed, please check that this field are filled correctly.
-    level: error
+    issue:
+        code: M0Type_SET_INCORRECTLY_TO_ABSENT
+        message: |
+            You defined M0Type as 'absent' while including a separate '*_m0scan.nii[.gz]' and
+            '*_m0scan.json', or defining the 'M0Estimate' field.
+            This is not allowed, please check that this field are filled correctly.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
     - associations contains "m0scan"
+    - sidecar contains "M0Type"
     checks:
     - sidecar.M0Type != "absent"
 
 # 199
 ASLM0TypeAbsentASLContext:
-    code: M0Type_SET_INCORRECTLY_TO_ABSENT_IN_ASLCONTEXT
-    description: |
-        You defined M0Type as 'absent' while including an m0scan volume within the '*_aslcontext.tsv'.
-        This is not allowed, please check that this field are filled correctly.
-    level: error
+    issue:
+        code: M0Type_SET_INCORRECTLY_TO_ABSENT_IN_ASLCONTEXT
+        message: |
+            You defined M0Type as 'absent' while including an m0scan volume within the '*_aslcontext.tsv'.
+            This is not allowed, please check that this field are filled correctly.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
     - aslcontext.volume_type contains "m0scan"
+    - sidecar contains "M0Type"
     checks:
     - sidecar.M0Type != "absent"
 
 # 202
 ASLM0TypeIncorrect:
-    code: M0Type_SET_INCORRECTLY
-    description: |
-        M0Type was not defined correctly.
-        If 'M0Type' is equal to 'separate', the dataset should include a *_m0scan.nii[.gz] and *_m0scan.json file.
-    level: error
+    issue:
+        code: M0Type_SET_INCORRECTLY
+        message: |
+            M0Type was not defined correctly.
+            If 'M0Type' is equal to 'separate', the dataset should include a *_m0scan.nii[.gz] and *_m0scan.json file.
+        level: error
     selectors:
     - suffix == "asl"
     - associations contains "aslcontext"
+    - sidecar contains "M0Type"
     - sidecar.M0Type == "separate"
     checks:
     - associations contains "m0scan"
diff --git a/src/schema/rules/sidecars/beh.yaml b/src/schema/rules/sidecars/beh.yaml
index 74052ff92a..dc863f12c4 100644
--- a/src/schema/rules/sidecars/beh.yaml
+++ b/src/schema/rules/sidecars/beh.yaml
@@ -11,11 +11,11 @@ BEHTabularData:
     selectors:
     - suffix in ["beh", "events"]
     fields:
-        TaskName: RECOMMENDED
-        Instructions: RECOMMENDED
-        TaskDescription: RECOMMENDED
-        CogAtlasID: RECOMMENDED
-        CogPOID: RECOMMENDED
-        InstitutionName: RECOMMENDED
-        InstitutionAddress: RECOMMENDED
-        InstitutionalDepartmentName: RECOMMENDED
+        TaskName: recommended
+        Instructions: recommended
+        TaskDescription: recommended
+        CogAtlasID: recommended
+        CogPOID: recommended
+        InstitutionName: recommended
+        InstitutionAddress: recommended
+        InstitutionalDepartmentName: recommended
diff --git a/src/schema/rules/sidecars/continuous.yaml b/src/schema/rules/sidecars/continuous.yaml
index 9325f4daf0..cdfe0e1ef4 100644
--- a/src/schema/rules/sidecars/continuous.yaml
+++ b/src/schema/rules/sidecars/continuous.yaml
@@ -11,16 +11,16 @@ Continuous:
     selectors:
     - suffix in ["physio", "stim"]
     fields:
-        SamplingFrequency: REQUIRED
-        StartTime: REQUIRED
-        Columns: REQUIRED
+        SamplingFrequency: required
+        StartTime: required
+        Columns: required
 
-# Other RECOMMENDED metadata for physiological data
+# Other recommended metadata for physiological data
 Physio:
     selectors:
     - suffix == "physio"
     fields:
-        Manufacturer: RECOMMENDED
-        ManufacturersModelName: RECOMMENDED
-        SoftwareVersions: RECOMMENDED
-        DeviceSerialNumber: RECOMMENDED
+        Manufacturer: recommended
+        ManufacturersModelName: recommended
+        SoftwareVersions: recommended
+        DeviceSerialNumber: recommended
diff --git a/src/schema/rules/sidecars/dwi.yaml b/src/schema/rules/sidecars/dwi.yaml
index aea15ca5e2..0f25d3ee1a 100644
--- a/src/schema/rules/sidecars/dwi.yaml
+++ b/src/schema/rules/sidecars/dwi.yaml
@@ -10,16 +10,16 @@
 # NOTE: I don't think this can be schemafied, since it depends on owner intent.
 MRIDiffusionMultipart:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "dwi"
     fields:
-        MultipartID: REQUIRED
+        MultipartID: required
 
-# Other RECOMMENDED metadata
+# Other recommended metadata
 MRIDiffusionOtherMetadata:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "dwi"
     fields:
-        PhaseEncodingDirection: RECOMMENDED
-        TotalReadoutTime: RECOMMENDED
+        PhaseEncodingDirection: recommended
+        TotalReadoutTime: recommended
diff --git a/src/schema/rules/sidecars/eeg.yaml b/src/schema/rules/sidecars/eeg.yaml
index d1a217e3f2..ec630cfcea 100644
--- a/src/schema/rules/sidecars/eeg.yaml
+++ b/src/schema/rules/sidecars/eeg.yaml
@@ -14,32 +14,32 @@ EEGGeneric:
     - suffix == "eeg"
     fields:
         TaskName:
-            level: REQUIRED
+            level: required
             description_addendum: |
-                A RECOMMENDED convention is to name resting state task using labels
+                A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
-EEGRecommended:
+EEGrecommended:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
     - suffix == "eeg"
     fields:
-        InstitutionName: RECOMMENDED
-        InstitutionAddress: RECOMMENDED
-        InstitutionalDepartmentName: RECOMMENDED
-        Manufacturer: RECOMMENDED
-        ManufacturersModelName: RECOMMENDED
-        SoftwareVersions: RECOMMENDED
-        TaskDescription: RECOMMENDED
+        InstitutionName: recommended
+        InstitutionAddress: recommended
+        InstitutionalDepartmentName: recommended
+        Manufacturer: recommended
+        ManufacturersModelName: recommended
+        SoftwareVersions: recommended
+        TaskDescription: recommended
         Instructions:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 This is especially important in context of resting state recordings and
                 distinguishing between eyes open and eyes closed paradigms.
-        CogAtlasID: RECOMMENDED
-        CogPOID: RECOMMENDED
-        DeviceSerialNumber: RECOMMENDED
+        CogAtlasID: recommended
+        CogPOID: recommended
+        DeviceSerialNumber: recommended
 
 EEGRequired:
     selectors:
@@ -47,37 +47,37 @@ EEGRequired:
     - datatype == "eeg"
     - suffix == "eeg"
     fields:
-        EEGReference: REQUIRED
+        EEGReference: required
         SamplingFrequency:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 The sampling frequency of data channels that deviate from the main sampling
                 frequency SHOULD be specified in the `channels.tsv` file.
-        PowerLineFrequency: REQUIRED
-        SoftwareFilters: REQUIRED
+        PowerLineFrequency: required
+        SoftwareFilters: required
 
-EEGMoreRecommended:
+EEGMorerecommended:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
     - suffix == "eeg"
     fields:
-        CapManufacturer: RECOMMENDED
-        CapManufacturersModelName: RECOMMENDED
-        EEGChannelCount: RECOMMENDED
-        ECGChannelCount: RECOMMENDED
-        EMGChannelCount: RECOMMENDED
-        EOGChannelCount: RECOMMENDED
-        MiscChannelCount: RECOMMENDED
-        TriggerChannelCount: RECOMMENDED
-        RecordingDuration: RECOMMENDED
-        RecordingType: RECOMMENDED
-        EpochLength: RECOMMENDED
-        EEGGround: RECOMMENDED
-        HeadCircumference: RECOMMENDED
-        EEGPlacementScheme: RECOMMENDED
-        HardwareFilters: RECOMMENDED
-        SubjectArtefactDescription: RECOMMENDED
+        CapManufacturer: recommended
+        CapManufacturersModelName: recommended
+        EEGChannelCount: recommended
+        ECGChannelCount: recommended
+        EMGChannelCount: recommended
+        EOGChannelCount: recommended
+        MiscChannelCount: recommended
+        TriggerChannelCount: recommended
+        RecordingDuration: recommended
+        RecordingType: recommended
+        EpochLength: recommended
+        EEGGround: recommended
+        HeadCircumference: recommended
+        EEGPlacementScheme: recommended
+        HardwareFilters: recommended
+        SubjectArtefactDescription: recommended
 
 # General fields
 EEGCoordsystemGeneral:
@@ -87,7 +87,7 @@ EEGCoordsystemGeneral:
     - suffix == "coordsystem"
     fields:
         IntendedFor:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
                 This identifies the MRI or CT scan associated with the electrodes,
                 landmarks, and fiducials.
@@ -99,20 +99,21 @@ EEGCoordsystemPositions:
     - datatype == "eeg"
     - suffix == "coordsystem"
     fields:
-        EEGCoordinateSystem: REQUIRED
-        EEGCoordinateUnits: REQUIRED
+        EEGCoordinateSystem: required
+        EEGCoordinateUnits: required
         EEGCoordinateSystemDescription:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `EEGCoordinateSystem` is `"Other"`
+            level: recommended
+            level_addendum: required if `EEGCoordinateSystem` is `"Other"`
 
 EEGCoordsystemOther:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
     - suffix == "coordsystem"
+    - sidecar contains "EEGCoordinateSystem"
     - sidecar.EEGCoordinateSystem == "Other"
     fields:
-        EEGCoordinateSystemDescription: REQUIRED
+        EEGCoordinateSystemDescription: required
 
 # Fields relating to the position of fiducials measured during an EEG session/run
 EEGCoordsystemFiducials:
@@ -121,13 +122,13 @@ EEGCoordsystemFiducials:
     - datatype == "eeg"
     - suffix == "coordsystem"
     fields:
-        FiducialsDescription: OPTIONAL
-        FiducialsCoordinates: RECOMMENDED
-        FiducialsCoordinateSystem: RECOMMENDED
-        FiducialsCoordinateUnits: RECOMMENDED
+        FiducialsDescription: optional
+        FiducialsCoordinates: recommended
+        FiducialsCoordinateSystem: recommended
+        FiducialsCoordinateUnits: recommended
         FiducialsCoordinateSystemDescription:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `FiducialsCoordinateSystem` is `"Other"`
+            level: recommended
+            level_addendum: required if `FiducialsCoordinateSystem` is `"Other"`
 
 EEGCoordsystemOtherFiducialCoordinateSystem:
     selectors:
@@ -136,7 +137,7 @@ EEGCoordsystemOtherFiducialCoordinateSystem:
     - suffix == "coordsystem"
     - FiducialsCoordinateSystem == "Other"
     fields:
-        FiducialsCoordinateSystemDescription: REQUIRED
+        FiducialsCoordinateSystemDescription: required
 
 # Fields relating to the position of anatomical landmark measured during an EEG session/run
 EEGCoordsystemLandmark:
@@ -145,20 +146,21 @@ EEGCoordsystemLandmark:
     - datatype == "eeg"
     - suffix == "coordsystem"
     fields:
-        AnatomicalLandmarkCoordinates: RECOMMENDED
+        AnatomicalLandmarkCoordinates: recommended
         AnatomicalLandmarkCoordinateSystem:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Preferably the same as the `EEGCoordinateSystem`.
-        AnatomicalLandmarkCoordinateUnits: RECOMMENDED
+        AnatomicalLandmarkCoordinateUnits: recommended
         AnatomicalLandmarkCoordinateSystemDescription:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `AnatomicalLandmarkCoordinateSystem` is `"Other"`
+            level: recommended
+            level_addendum: required if `AnatomicalLandmarkCoordinateSystem` is `"Other"`
 
 EEGCoordsystemAnatomicalLandmarkCoordinateSystemDescription:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
     - suffix == "coordsystem"
+    - sidecar contains "AnatomicalLandmarkCoordinateSystem"
     - sidecar.AnatomicalLandmarkCoordinateSystem == "Other"
     fields:
-        AnatomicalLandmarkCoordinateSystemDescription: REQUIRED
+        AnatomicalLandmarkCoordinateSystemDescription: required
diff --git a/src/schema/rules/sidecars/entities.yaml b/src/schema/rules/sidecars/entities.yaml
index 3fcc796da6..3147815569 100644
--- a/src/schema/rules/sidecars/entities.yaml
+++ b/src/schema/rules/sidecars/entities.yaml
@@ -13,58 +13,58 @@ EntitiesTaskMetadata:
     selectors:
     - entities contains "task"
     fields:
-        TaskName: RECOMMENDED
+        TaskName: recommended
 
 EntitiesCeMetadata:
     selectors:
     - entities contains "ce"
     fields:
-        ContrastBolusIngredient: OPTIONAL
+        ContrastBolusIngredient: optional
 
 EntitiesTrcMetadata:
     selectors:
     - entities contains "trc"
     fields:
-        TracerName: REQUIRED
+        TracerName: required
 
 EntitiesStainMetadata:
     selectors:
     - entities contains "stain"
     fields:
-        SampleStaining: RECOMMENDED
-        SamplePrimaryAntibodies: RECOMMENDED
-        SampleSecondaryAntibodies: RECOMMENDED
+        SampleStaining: recommended
+        SamplePrimaryAntibodies: recommended
+        SampleSecondaryAntibodies: recommended
 
 EntitiesEchoMetadata:
     selectors:
     - entities contains "echo"
     fields:
-        EchoTime: REQUIRED
+        EchoTime: required
 
 EntitiesFlipMetadata:
     selectors:
     - entities contains "flip"
     fields:
-        FlipAngle: REQUIRED
+        FlipAngle: required
 
 EntitiesInvMetadata:
     selectors:
     - entities contains "inv"
     fields:
-        InversionTime: REQUIRED
+        InversionTime: required
 
 EntitiesMTMetadata:
     selectors:
     - entities contains "mt"
     fields:
-        MTState: REQUIRED
+        MTState: required
 
 EntitiesPartMetadata:
     selectors:
     - entities.part == "phase"
     fields:
         Units:
-            level: REQUIRED
+            level: required
             rules:
             - value in ["rad", "arbitrary"]
 
@@ -72,10 +72,10 @@ EntitiesResMetadata:
     selectors:
     - entities contains "res"
     fields:
-        Resolution: REQUIRED
+        Resolution: required
 
 EntitiesDenMetadata:
     selectors:
     - entities contains "den"
     fields:
-        Density: REQUIRED
+        Density: required
diff --git a/src/schema/rules/sidecars/events_validation.yaml b/src/schema/rules/sidecars/events_validation.yaml
index 4e735a38e0..58774358b9 100644
--- a/src/schema/rules/sidecars/events_validation.yaml
+++ b/src/schema/rules/sidecars/events_validation.yaml
@@ -3,14 +3,15 @@
 
 # 25
 EventsMissing:
-    code: EVENTS_TSV_MISSING
-    description: |
-        Task scans should have a corresponding events.tsv file.
-        If this is a resting state scan you can ignore this warning or rename the task to include the word "rest".
-    level: warning  # could be an error with the proper selectors, I think
+    issue:
+        code: EVENTS_TSV_MISSING
+        message: |
+            Task scans should have a corresponding events.tsv file.
+            If this is a resting state scan you can ignore this warning or rename the task to include the word "rest".
+        level: warning  # could be an error with the proper selectors, I think
     selectors:
     - entities contains "task"
     - entities.task != "rest"
-    - entities.task not contains "rest"  # Alternative for including the word "rest"
+    - entities.task not(contains "rest")  # Alternative for including the word "rest"
     checks:
     - associations contains "events"
diff --git a/src/schema/rules/sidecars/fmap.yaml b/src/schema/rules/sidecars/fmap.yaml
index 48291235be..9d9b7b7b05 100644
--- a/src/schema/rules/sidecars/fmap.yaml
+++ b/src/schema/rules/sidecars/fmap.yaml
@@ -12,7 +12,7 @@ MRIFieldmapB0FieldIdentifier:
     - modality == "MRI"
     - datatype == "fmap"
     fields:
-        B0FieldIdentifier: RECOMMENDED
+        B0FieldIdentifier: recommended
 
 MRIFieldmapIntendedFor:
     selectors:
@@ -20,9 +20,9 @@ MRIFieldmapIntendedFor:
     - datatype == "fmap"
     fields:
         IntendedFor:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
-                This field is OPTIONAL, and in case the fieldmaps do not correspond
+                This field is optional, and in case the fieldmaps do not correspond
                 to any particular scans, it does not have to be filled.
 
 # Case 1: Phase-difference map and at least one magnitude image
@@ -32,8 +32,8 @@ MRIFieldmapPhaseDifferencePhasediff:
     - datatype == "fmap"
     - suffix == "phasediff"
     fields:
-        EchoTime1: REQUIRED
-        EchoTime2: REQUIRED
+        EchoTime1: required
+        EchoTime2: required
 
 MRIFieldmapPhaseDifferenceMagnitude1:
     selectors:
@@ -41,7 +41,7 @@ MRIFieldmapPhaseDifferenceMagnitude1:
     - datatype == "fmap"
     - suffix == "magnitude1"
     fields:
-        EchoTime1: REQUIRED
+        EchoTime1: required
 
 MRIFieldmapPhaseDifferenceMagnitude2:
     selectors:
@@ -49,7 +49,7 @@ MRIFieldmapPhaseDifferenceMagnitude2:
     - datatype == "fmap"
     - suffix == "magnitude2"
     fields:
-        EchoTime2: REQUIRED
+        EchoTime2: required
 
 # Case 2: Two phase maps and two magnitude images
 # NOTE: Need to check for presence of related files.
@@ -61,7 +61,7 @@ MRIFieldmapTwoPhase:
     - datatype == "fmap"
     - suffix in ["phase1", "phase2", "magnitude1", "magnitude2"]
     fields:
-        EchoTime__fmap: REQUIRED
+        EchoTime__fmap: required
 
 # Case 3: Direct field mapping
 MRIFieldmapDirectFieldMapping:
@@ -71,7 +71,7 @@ MRIFieldmapDirectFieldMapping:
     - suffix in ["phase", "fieldmap"]
     fields:
         Units:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 Fieldmaps must be in units of Hertz (`"Hz"`),
                 radians per second (`"rad/s"`), or Tesla (`"T"`).
@@ -83,5 +83,5 @@ MRIFieldmapPepolar:
     - datatype == "fmap"
     - suffix == "epi"
     fields:
-        PhaseEncodingDirection: REQUIRED
-        TotalReadoutTime: REQUIRED
+        PhaseEncodingDirection: required
+        TotalReadoutTime: required
diff --git a/src/schema/rules/sidecars/fmap_validation.yaml b/src/schema/rules/sidecars/fmap_validation.yaml
index 53c231d89e..b33cf18c90 100644
--- a/src/schema/rules/sidecars/fmap_validation.yaml
+++ b/src/schema/rules/sidecars/fmap_validation.yaml
@@ -3,10 +3,11 @@
 
 # 91
 FmapFieldmapWithoutMagnitude:
-    code: _FIELDMAP_WITHOUT_MAGNITUDE_FILE
-    description: |
-        '_fieldmap.nii[.gz]' file does not have accompanying '_magnitude.nii[.gz]' file.
-    level: error
+    issue:
+        code: _FIELDMAP_WITHOUT_MAGNITUDE_FILE
+        message: |
+            '_fieldmap.nii[.gz]' file does not have accompanying '_magnitude.nii[.gz]' file.
+        level: error
     selectors:
     - suffix == "fieldmap"
     checks:
@@ -14,10 +15,11 @@ FmapFieldmapWithoutMagnitude:
 
 # 92
 FmapPhasediffWithoutMagnitude:
-    code: MISSING_MAGNITUDE1_FILE
-    description: |
-        Each '_phasediff.nii[.gz]' file should be associations with a '_magnitude1.nii[.gz]' file.
-    level: warning
+    issue:
+        code: MISSING_MAGNITUDE1_FILE
+        message: |
+            Each '_phasediff.nii[.gz]' file should be associations with a '_magnitude1.nii[.gz]' file.
+        level: warning
     selectors:
     - suffix == "phasediff"
     checks:
diff --git a/src/schema/rules/sidecars/func.yaml b/src/schema/rules/sidecars/func.yaml
index 43bd5f286f..ffdcb45108 100644
--- a/src/schema/rules/sidecars/func.yaml
+++ b/src/schema/rules/sidecars/func.yaml
@@ -11,100 +11,100 @@
 # Required fields
 MRIFuncRequired:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     fields:
-        RepetitionTime: REQUIRED
-        VolumeTiming: REQUIRED
+        RepetitionTime: required
+        VolumeTiming: required
         TaskName:
-            level: REQUIRED
+            level: required
             description_addendum: |
-                A RECOMMENDED convention is to name resting state task using labels
+                A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
 # Timing Parameters
 MRIFuncTimingParameters:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     fields:
-        NumberOfVolumesDiscardedByScanner: RECOMMENDED
-        NumberOfVolumesDiscardedByUser: RECOMMENDED
-        DelayTime: RECOMMENDED
+        NumberOfVolumesDiscardedByScanner: recommended
+        NumberOfVolumesDiscardedByUser: recommended
+        DelayTime: recommended
         AcquisitionDuration:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                REQUIRED for sequences that are described with the `VolumeTiming`
+                required for sequences that are described with the `VolumeTiming`
                 field and that do not have the `SliceTiming` field set to allow for
                 accurate calculation of "acquisition time"
             issue:
                 name: VOLUME_TIMING_MISSING_ACQUISITION_DURATION
                 message: |
                     The field 'VolumeTiming' requires 'AcquisitionDuration' or 'SliceTiming' to be defined.
-        DelayAfterTrigger: RECOMMENDED
+        DelayAfterTrigger: recommended
 
 # The mutual exclusion table, spread across 5 definitions
-# NOTE: This introduces a PROHIBITED level
+# NOTE: This introduces a prohibited level
 MRIFuncTimingParametersMutualExclusion1:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     - sidecar contains "RepetitionTime"
     fields:
-        AcquisitionDuration: PROHIBITED
-        VolumeTiming: PROHIBITED
+        AcquisitionDuration: prohibited
+        VolumeTiming: prohibited
 
 MRIFuncTimingParametersMutualExclusion2:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     - sidecar contains "SliceTiming"
     - sidecar contains "VolumeTiming"
     fields:
-        RepetitionTime: PROHIBITED
-        DelayTime: PROHIBITED
+        RepetitionTime: prohibited
+        DelayTime: prohibited
 
 MRIFuncTimingParametersMutualExclusion3:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     - sidecar contains "AcquisitionDuration"
     - sidecar contains "VolumeTiming"
     fields:
-        RepetitionTime: PROHIBITED
-        DelayTime: PROHIBITED
+        RepetitionTime: prohibited
+        DelayTime: prohibited
 
 MRIFuncTimingParametersMutualExclusion4:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     - sidecar contains "RepetitionTime"
     - sidecar contains "SliceTiming"
     fields:
-        AcquisitionDuration: PROHIBITED
-        VolumeTiming: PROHIBITED
+        AcquisitionDuration: prohibited
+        VolumeTiming: prohibited
 
 MRIFuncTimingParametersMutualExclusion5:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     - sidecar contains "RepetitionTime"
     - sidecar contains "DelayTime"
     fields:
-        AcquisitionDuration: PROHIBITED
-        VolumeTiming: PROHIBITED
+        AcquisitionDuration: prohibited
+        VolumeTiming: prohibited
 
 # fMRI task information
 MRIFuncTaskInformation:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "func"
     fields:
         Instructions:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 This is especially important in context of resting state recordings and
                 distinguishing between eyes open and eyes closed paradigms.
-        TaskDescription: RECOMMENDED
-        CogAtlasID: RECOMMENDED
-        CogPOID: RECOMMENDED
+        TaskDescription: recommended
+        CogAtlasID: recommended
+        CogPOID: recommended
diff --git a/src/schema/rules/sidecars/ieeg.yaml b/src/schema/rules/sidecars/ieeg.yaml
index 8cc9290d72..9f51287f3b 100644
--- a/src/schema/rules/sidecars/ieeg.yaml
+++ b/src/schema/rules/sidecars/ieeg.yaml
@@ -14,34 +14,34 @@ iEEGGeneric:
     - suffix == "ieeg"
     fields:
         TaskName:
-            level: REQUIRED
+            level: required
             description_addendum: |
-                A RECOMMENDED convention is to name resting state task using labels
+                A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
-iEEGRecommended:
+iEEGrecommended:
     selectors:
     - modality == "ieeg"
     - datatype == "ieeg"
     - suffix == "ieeg"
     fields:
-        InstitutionName: RECOMMENDED
-        InstitutionAddress: RECOMMENDED
-        InstitutionalDepartmentName: RECOMMENDED
+        InstitutionName: recommended
+        InstitutionAddress: recommended
+        InstitutionalDepartmentName: recommended
         Manufacturer:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: For example, `"TDT"`, `"Blackrock"`.
-        ManufacturersModelName: RECOMMENDED
-        SoftwareVersions: RECOMMENDED
-        TaskDescription: RECOMMENDED
+        ManufacturersModelName: recommended
+        SoftwareVersions: recommended
+        TaskDescription: recommended
         Instructions:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 This is especially important in context of resting state recordings and
                 distinguishing between eyes open and eyes closed paradigms.
-        CogAtlasID: RECOMMENDED
-        CogPOID: RECOMMENDED
-        DeviceSerialNumber: RECOMMENDED
+        CogAtlasID: recommended
+        CogPOID: recommended
+        DeviceSerialNumber: recommended
 
 # Specific iEEG fields MUST be present
 iEEGRequired:
@@ -50,14 +50,14 @@ iEEGRequired:
     - datatype == "ieeg"
     - suffix == "ieeg"
     fields:
-        iEEGReference: REQUIRED
+        iEEGReference: required
         SamplingFrequency:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 The sampling frequency of data channels that deviate from the main sampling
                 frequency SHOULD be specified in the `channels.tsv` file.
-        PowerLineFrequency: REQUIRED
-        SoftwareFilters": REQUIRED
+        PowerLineFrequency: required
+        SoftwareFilters": required
 
 # Specific iEEG fields SHOULD be present
 iEEGMoreRecommended:
@@ -66,25 +66,25 @@ iEEGMoreRecommended:
     - datatype == "ieeg"
     - suffix == "ieeg"
     fields:
-        DCOffsetCorrection: DEPRECATED
-        HardwareFilters: RECOMMENDED
-        ElectrodeManufacturer: RECOMMENDED
-        ElectrodeManufacturersModelName: RECOMMENDED
-        ECOGChannelCount: RECOMMENDED
-        SEEGChannelCount: RECOMMENDED
-        EEGChannelCount: RECOMMENDED
-        EOGChannelCount: RECOMMENDED
-        ECGChannelCount: RECOMMENDED
-        EMGChannelCount: RECOMMENDED
-        MiscChannelCount: RECOMMENDED
-        TriggerChannelCount: RECOMMENDED
-        RecordingDuration: RECOMMENDED
-        RecordingType: RECOMMENDED
-        EpochLength: RECOMMENDED
-        iEEGGround: RECOMMENDED
-        iEEGPlacementScheme: RECOMMENDED
-        iEEGElectrodeGroups: RECOMMENDED
-        SubjectArtefactDescription: RECOMMENDED
+        DCOffsetCorrection: deprecated
+        HardwareFilters: recommended
+        ElectrodeManufacturer: recommended
+        ElectrodeManufacturersModelName: recommended
+        ECOGChannelCount: recommended
+        SEEGChannelCount: recommended
+        EEGChannelCount: recommended
+        EOGChannelCount: recommended
+        ECGChannelCount: recommended
+        EMGChannelCount: recommended
+        MiscChannelCount: recommended
+        TriggerChannelCount: recommended
+        RecordingDuration: recommended
+        RecordingType: recommended
+        EpochLength: recommended
+        iEEGGround: recommended
+        iEEGPlacementScheme: recommended
+        iEEGElectrodeGroups: recommended
+        SubjectArtefactDescription: recommended
 
 # Specific iEEG fields MAY be present
 iEEGOptional:
@@ -93,8 +93,8 @@ iEEGOptional:
     - datatype == "ieeg"
     - suffix == "ieeg"
     fields:
-        ElectricalStimulation: OPTIONAL
-        ElectricalStimulationParameters: OPTIONAL
+        ElectricalStimulation: optional
+        ElectricalStimulationParameters: optional
 
 # General fields
 iEEGCoordsystemGeneral:
@@ -104,7 +104,7 @@ iEEGCoordsystemGeneral:
     - suffix == "coordsystem"
     fields:
         IntendedFor:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
                 If only a surface reconstruction is available, this should point to
                 the surface reconstruction file.
@@ -125,19 +125,20 @@ iEEGCoordsystemPositions:
     - datatype == "ieeg"
     - suffix == "coordsystem"
     fields:
-        iEEGCoordinateSystem: REQUIRED
-        iEEGCoordinateUnits: REQUIRED
+        iEEGCoordinateSystem: required
+        iEEGCoordinateUnits: required
         iEEGCoordinateSystemDescription:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if `iEEGCoordinateSystem` is `"Other"`
-        iEEGCoordinateProcessingDescription: RECOMMENDED
-        iEEGCoordinateProcessingReference: RECOMMENDED
+            level: recommended
+            level_addendum: required if `iEEGCoordinateSystem` is `"Other"`
+        iEEGCoordinateProcessingDescription: recommended
+        iEEGCoordinateProcessingReference: recommended
 
 iEEGCoordsystemOther:
     selectors:
     - modality == "ieeg"
     - datatype == "ieeg"
     - suffix == "coordsystem"
+    - sidecar contains "iEEGCoordinateSystem"
     - sidecar.iEEGCoordinateSystem == "Other"
     fields:
-        iEEGCoordinateSystemDescription: REQUIRED
+        iEEGCoordinateSystemDescription: required
diff --git a/src/schema/rules/sidecars/meg.yaml b/src/schema/rules/sidecars/meg.yaml
index aa822ab4cc..e969c5d91f 100644
--- a/src/schema/rules/sidecars/meg.yaml
+++ b/src/schema/rules/sidecars/meg.yaml
@@ -16,9 +16,9 @@ MEGGeneric:
     - suffix == "meg"
     fields:
         TaskName:
-            level: REQUIRED
+            level: required
             description_addendum: |
-                A RECOMMENDED convention is to name resting state task using labels
+                A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
 MEGRecommended:
@@ -27,11 +27,11 @@ MEGRecommended:
     - datatype == "meg"
     - suffix == "meg"
     fields:
-        InstitutionName: RECOMMENDED
-        InstitutionAddress: RECOMMENDED
-        InstitutionalDepartmentName: RECOMMENDED
+        InstitutionName: recommended
+        InstitutionAddress: recommended
+        InstitutionalDepartmentName: recommended
         Manufacturer:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 For MEG scanners, this must be one of:
                 `"CTF"`, `"Elekta/Neuromag"`, `"BTi/4D"`, `"KIT/Yokogawa"`,
@@ -39,20 +39,20 @@ MEGRecommended:
                 See [Appendix VII](/99-appendices/07-meg-systems.html) for
                 preferred names.
         ManufacturersModelName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 See [Appendix VII](/99-appendices/07-meg-systems.html) for
                 preferred names.
-        SoftwareVersions: RECOMMENDED
-        TaskDescription: RECOMMENDED
+        SoftwareVersions: recommended
+        TaskDescription: recommended
         Instructions:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 This is especially important in context of resting state recordings and
                 distinguishing between eyes open and eyes closed paradigms.
-        CogAtlasID: RECOMMENDED
-        CogPOID: RECOMMENDED
-        DeviceSerialNumber: RECOMMENDED
+        CogAtlasID: recommended
+        CogPOID: recommended
+        DeviceSerialNumber: recommended
 
 # Specific MEG fields MUST be present
 MEGRequired:
@@ -62,15 +62,15 @@ MEGRequired:
     - suffix == "meg"
     fields:
         SamplingFrequency:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 The sampling frequency of data channels that deviate from the main sampling
                 frequency SHOULD be specified in the `channels.tsv` file.
-        PowerLineFrequency: REQUIRED
-        DewarPosition: REQUIRED
-        SoftwareFilters: REQUIRED
-        DigitizedLandmarks: REQUIRED
-        DigitizedHeadPoints: REQUIRED
+        PowerLineFrequency: required
+        DewarPosition: required
+        SoftwareFilters: required
+        DigitizedLandmarks: required
+        DigitizedHeadPoints: required
 
 # Specific MEG fields SHOULD be present
 MEGMoreRecommended:
@@ -79,25 +79,25 @@ MEGMoreRecommended:
     - datatype == "meg"
     - suffix == "meg"
     fields:
-        MEGChannelCount: RECOMMENDED
-        MEGREFChannelCount: RECOMMENDED
-        EEGChannelCount: RECOMMENDED
-        ECOGChannelCount: RECOMMENDED
-        SEEGChannelCount: RECOMMENDED
-        EOGChannelCount: RECOMMENDED
-        ECGChannelCount: RECOMMENDED
-        EMGChannelCount: RECOMMENDED
-        MiscChannelCount: RECOMMENDED
-        TriggerChannelCount: RECOMMENDED
-        RecordingDuration: RECOMMENDED
-        RecordingType: RECOMMENDED
-        EpochLength: RECOMMENDED
-        ContinuousHeadLocalization: RECOMMENDED
-        HeadCoilFrequency: RECOMMENDED
-        MaxMovement: RECOMMENDED
-        SubjectArtefactDescription: RECOMMENDED
-        AssociatedEmptyRoom: RECOMMENDED
-        HardwareFilters: RECOMMENDED
+        MEGChannelCount: recommended
+        MEGREFChannelCount: recommended
+        EEGChannelCount: recommended
+        ECOGChannelCount: recommended
+        SEEGChannelCount: recommended
+        EOGChannelCount: recommended
+        ECGChannelCount: recommended
+        EMGChannelCount: recommended
+        MiscChannelCount: recommended
+        TriggerChannelCount: recommended
+        RecordingDuration: recommended
+        RecordingType: recommended
+        EpochLength: recommended
+        ContinuousHeadLocalization: recommended
+        HeadCoilFrequency: recommended
+        MaxMovement: recommended
+        SubjectArtefactDescription: recommended
+        AssociatedEmptyRoom: recommended
+        HardwareFilters: recommended
 
 # Specific EEG fields
 # NOTE: I'm not sure if "EEG is present" is enough to indicate simultaneous EEG/MEG.
@@ -108,10 +108,10 @@ MEGwithEEG:
     - suffix == "meg"
     - dataset.modalities contains "EEG"
     fields:
-        EEGPlacementScheme: OPTIONAL
-        CapManufacturer: OPTIONAL
-        CapManufacturersModelName: OPTIONAL
-        EEGReference: OPTIONAL
+        EEGPlacementScheme: optional
+        CapManufacturer: optional
+        CapManufacturersModelName: optional
+        EEGReference: optional
 
 # MEG and EEG sensors
 MEGCoordsystemWithEEG:
@@ -120,21 +120,21 @@ MEGCoordsystemWithEEG:
     - datatype == "meg"
     - suffix == "coordsystem"
     fields:
-        MEGCoordinateSystem: REQUIRED
-        MEGCoordinateUnits: REQUIRED
+        MEGCoordinateSystem: required
+        MEGCoordinateUnits: required
         MEGCoordinateSystemDescription:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `MEGCoordinateSystem` is `Other`
+            level: optional
+            level_addendum: required if `MEGCoordinateSystem` is `Other`
         EEGCoordinateSystem:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
                 See [Recording EEG simultaneously with MEG]
                 (/04-modality-specific-files/02-magnetoencephalography.html#recording-eeg-simultaneously-with-meg).
                 Preferably the same as the `MEGCoordinateSystem`.
-        EEGCoordinateUnits: OPTIONAL
+        EEGCoordinateUnits: optional
         EEGCoordinateSystemDescription:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `EEGCoordinateSystem` is `Other`
+            level: optional
+            level_addendum: required if `EEGCoordinateSystem` is `Other`
             description_addendum: |
                 See [Recording EEG simultaneously with MEG]
                 (/04-modality-specific-files/02-magnetoencephalography.html#recording-eeg-simultaneously-with-meg).
@@ -145,9 +145,10 @@ MEGCoordsystemWithEEGMEGCoordinateSystem:
     - modality == "meg"
     - datatype == "meg"
     - suffix == "coordsystem"
+    - sidecar contains "MEGCoordinateSystem"
     - sidecar.MEGCoordinateSystem == "Other"
     fields:
-        MEGCoordinateSystemDescription: REQUIRED
+        MEGCoordinateSystemDescription: required
 
 # NOTE: Not sure if this requires simult. EEG
 MEGCoordsystemWithEEGEEGCoordinateSystem:
@@ -155,9 +156,10 @@ MEGCoordsystemWithEEGEEGCoordinateSystem:
     - modality == "meg"
     - datatype == "meg"
     - suffix == "coordsystem"
+    - sidecar contains "EEGCoordinateSystem"
     - sidecar.EEGCoordinateSystem == "Other"
     fields:
-        EEGCoordinateSystemDescription: REQUIRED
+        EEGCoordinateSystemDescription: required
 
 # Head localization coils
 MEGCoordsystemHeadLocalizationCoils:
@@ -166,21 +168,22 @@ MEGCoordsystemHeadLocalizationCoils:
     - datatype == "meg"
     - suffix == "coordsystem"
     fields:
-        HeadCoilCoordinates: OPTIONAL
-        HeadCoilCoordinateSystem: OPTIONAL
-        HeadCoilCoordinateUnits: OPTIONAL
+        HeadCoilCoordinates: optional
+        HeadCoilCoordinateSystem: optional
+        HeadCoilCoordinateUnits: optional
         HeadCoilCoordinateSystemDescription:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `HeadCoilCoordinateSystem` is `Other`
+            level: optional
+            level_addendum: required if `HeadCoilCoordinateSystem` is `Other`
 
 MEGCoordsystemHeadLocalizationCoilsHeadCoilCoordinateSystem:
     selectors:
     - modality == "meg"
     - datatype == "meg"
     - suffix == "coordsystem"
+    - sidecar contains "HeadCoilCoordinateSystem"
     - sidecar.HeadCoilCoordinateSystem == "Other"
     fields:
-        HeadCoilCoordinateSystemDescription: REQUIRED
+        HeadCoilCoordinateSystemDescription: required
 
 # Digitized head points
 MEGCoordsystemDigitizedHeadPoints:
@@ -189,21 +192,22 @@ MEGCoordsystemDigitizedHeadPoints:
     - datatype == "meg"
     - suffix == "coordsystem"
     fields:
-        DigitizedHeadPoints: OPTIONAL
-        DigitizedHeadPointsCoordinateSystem: OPTIONAL
-        DigitizedHeadPointsCoordinateUnits: OPTIONAL
+        DigitizedHeadPoints: optional
+        DigitizedHeadPointsCoordinateSystem: optional
+        DigitizedHeadPointsCoordinateUnits: optional
         DigitizedHeadPointsCoordinateSystemDescription:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `DigitizedHeadPointsCoordinateSystem` is `Other`
+            level: optional
+            level_addendum: required if `DigitizedHeadPointsCoordinateSystem` is `Other`
 
 MEGCoordsystemDigitizedHeadPointsDigitizedHeadPointsCoordinateSystem:
     selectors:
     - modality == "meg"
     - datatype == "meg"
     - suffix == "coordsystem"
+    - sidecar contains "DigitizedHeadPointsCoordinateSystem"
     - sidecar.DigitizedHeadPointsCoordinateSystem == "Other"
     fields:
-        DigitizedHeadPointsCoordinateSystemDescription: REQUIRED
+        DigitizedHeadPointsCoordinateSystemDescription: required
 
 # Anatomical MRI
 MEGCoordsystemAnatomicalMRI:
@@ -214,7 +218,7 @@ MEGCoordsystemAnatomicalMRI:
     - dataset.modalities contains "anat"
     fields:
         IntendedFor:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
                 This is used to identify the structural MRI(s),
                 possibly of different types if a list is specified,
@@ -227,24 +231,25 @@ MEGCoordsystemAnatomicalLandmarks:
     - datatype == "meg"
     - suffix == "coordsystem"
     fields:
-        AnatomicalLandmarkCoordinates: OPTIONAL
+        AnatomicalLandmarkCoordinates: optional
         AnatomicalLandmarkCoordinateSystem:
-            level: OPTIONAL
+            level: optional
             description_addendum: |
                 Preferably the same as the `MEGCoordinateSystem`.
-        AnatomicalLandmarkCoordinateUnits: OPTIONAL
+        AnatomicalLandmarkCoordinateUnits: optional
         AnatomicalLandmarkCoordinateSystemDescription:
-            level: OPTIONAL
-            level_addendum: REQUIRED if `AnatomicalLandmarkCoordinateSystem` is `Other`
+            level: optional
+            level_addendum: required if `AnatomicalLandmarkCoordinateSystem` is `Other`
 
 MEGCoordsystemAnatomicalLandmarksAnatomicalLandmarkCoordinateSystem:
     selectors:
     - modality == "meg"
     - datatype == "meg"
     - suffix == "coordsystem"
+    - sidecar contains "AnatomicalLandmarkCoordinateSystem"
     - sidecar.AnatomicalLandmarkCoordinateSystem == "Other"
     fields:
-        AnatomicalLandmarkCoordinateSystemDescription: REQUIRED
+        AnatomicalLandmarkCoordinateSystemDescription: required
 
 # Fiducials information
 MEGCoordsystemFiducialsInformation:
@@ -253,4 +258,4 @@ MEGCoordsystemFiducialsInformation:
     - datatype == "meg"
     - suffix == "coordsystem"
     fields:
-        FiducialsDescription: OPTIONAL
+        FiducialsDescription: optional
diff --git a/src/schema/rules/sidecars/micr.yaml b/src/schema/rules/sidecars/micr.yaml
index a8b3d66ad1..99413ad890 100644
--- a/src/schema/rules/sidecars/micr.yaml
+++ b/src/schema/rules/sidecars/micr.yaml
@@ -9,71 +9,71 @@
 # Device Hardware
 MicroscopyDeviceHardware:
     selectors:
-    - modality == "MICR"
+    - modality == "micr"
     - datatype == "micr"
     fields:
-        Manufacturer: RECOMMENDED
-        ManufacturersModelName: RECOMMENDED
-        DeviceSerialNumber: RECOMMENDED
-        StationName: RECOMMENDED
-        SoftwareVersions: RECOMMENDED
-        InstitutionName: RECOMMENDED
-        InstitutionAddress: RECOMMENDED
-        InstitutionalDepartmentName: RECOMMENDED
+        Manufacturer: recommended
+        ManufacturersModelName: recommended
+        DeviceSerialNumber: recommended
+        StationName: recommended
+        SoftwareVersions: recommended
+        InstitutionName: recommended
+        InstitutionAddress: recommended
+        InstitutionalDepartmentName: recommended
 
 # Image Acquisition
 MicroscopyImageAcquisition:
     selectors:
-    - modality == "MICR"
+    - modality == "micr"
     - datatype == "micr"
     fields:
-        PixelSize: REQUIRED
-        PixelSizeUnits: REQUIRED
-        Immersion: OPTIONAL
-        NumericalAperture: OPTIONAL
-        Magnification: OPTIONAL
-        ImageAcquisitionProtocol: OPTIONAL
-        OtherAcquisitionParameters: OPTIONAL
+        PixelSize: required
+        PixelSizeUnits: required
+        Immersion: optional
+        NumericalAperture: optional
+        Magnification: optional
+        ImageAcquisitionProtocol: optional
+        OtherAcquisitionParameters: optional
 
 # Sample
 MicroscopySample:
     selectors:
-    - modality == "MICR"
+    - modality == "micr"
     - datatype == "micr"
     fields:
         BodyPart:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: |
                 From [DICOM Body Part Examined](http://dicom.nema.org/medical/dicom/current/
                 output/chtml/part16/chapter_L.html#chapter_L)
                 (for example `"BRAIN"`).
-        BodyPartDetails: RECOMMENDED
-        BodyPartDetailsOntology: OPTIONAL
-        SampleEnvironment: RECOMMENDED
-        SampleEmbedding: OPTIONAL
-        SampleFixation: OPTIONAL
-        SampleStaining: RECOMMENDED
-        SamplePrimaryAntibody: RECOMMENDED
-        SampleSecondaryAntibody: RECOMMENDED
-        SliceThickness: OPTIONAL
-        TissueDeformationScaling: OPTIONAL
-        SampleExtractionProtocol: OPTIONAL
-        SampleExtractionInstitution: OPTIONAL
+        BodyPartDetails: recommended
+        BodyPartDetailsOntology: optional
+        SampleEnvironment: recommended
+        SampleEmbedding: optional
+        SampleFixation: optional
+        SampleStaining: recommended
+        SamplePrimaryAntibody: recommended
+        SampleSecondaryAntibody: recommended
+        SliceThickness: optional
+        TissueDeformationScaling: optional
+        SampleExtractionProtocol: optional
+        SampleExtractionInstitution: optional
 
 # Chunk Transformations
 MicroscopyChunkTransformations:
     selectors:
-    - modality == "MICR"
+    - modality == "micr"
     - datatype == "micr"
     - entities contains "chunk"
     fields:
-        ChunkTransformationMatrix: RECOMMENDED
+        ChunkTransformationMatrix: recommended
 
 MicroscopyChunkTransformationsMatrixAxis:
     selectors:
-    - modality == "MICR"
+    - modality == "micr"
     - datatype == "micr"
     - entities contains "chunk"
     - sidecar contains "ChunkTransformationMatrix"
     fields:
-        ChunkTransformationMatrixAxis: REQUIRED
+        ChunkTransformationMatrixAxis: required
diff --git a/src/schema/rules/sidecars/mri.yaml b/src/schema/rules/sidecars/mri.yaml
index 67bec335f5..19ddb3a526 100644
--- a/src/schema/rules/sidecars/mri.yaml
+++ b/src/schema/rules/sidecars/mri.yaml
@@ -9,114 +9,118 @@
 # MRI Common metadata fields
 MRIScannerHardware:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
         Manufacturer:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 0070 `Manufacturer`.
         ManufacturersModelName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 1090 `Manufacturers Model Name`.
         DeviceSerialNumber:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0018, 1000 `DeviceSerialNumber`.
         StationName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 1010 `Station Name`.
         SoftwareVersions:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0018, 1020 `Software Versions`.
         HardcopyDeviceSoftwareVersion: DEPRECATED
         MagneticFieldStrength:
-            level: RECOMMENDED, but REQUIRED for Arterial Spin Labeling
-        ReceiveCoilName: RECOMMENDED
-        ReceiveCoilActiveElements: RECOMMENDED
-        GradientSetType: RECOMMENDED
-        MRTransmitCoilSequence: RECOMMENDED
-        MatrixCoilMode: RECOMMENDED
-        CoilCombinationMethod: RECOMMENDED
+            level: recommended, but required for Arterial Spin Labeling
+        ReceiveCoilName: recommended
+        ReceiveCoilActiveElements: recommended
+        GradientSetType: recommended
+        MRTransmitCoilSequence: recommended
+        MatrixCoilMode: recommended
+        CoilCombinationMethod: recommended
 
 MRISequenceSpecifics:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
-        PulseSequenceType: RECOMMENDED
-        ScanningSequence: RECOMMENDED
-        SequenceVariant: RECOMMENDED
-        ScanOptions: RECOMMENDED
-        SequenceName: RECOMMENDED
-        PulseSequenceDetails: RECOMMENDED
+        PulseSequenceType: recommended
+        ScanningSequence: recommended
+        SequenceVariant: recommended
+        ScanOptions: recommended
+        SequenceName: recommended
+        PulseSequenceDetails: recommended
         NonlinearGradientCorrection: |
-            RECOMMENDED, but REQUIRED if [PET](./09-positron-emission-tomography.md) data are present
-        MRAcquisitionType: RECOMMENDED, but REQUIRED for Arterial Spin Labeling
-        MTState: RECOMMENDED
-        MTOffsetFrequency: OPTIONAL
-        MTPulseBandwidth: OPTIONAL
-        MTNumberOfPulses: OPTIONAL
-        MTPulseShape: OPTIONAL
-        MTPulseDuration: OPTIONAL
-        SpoilingState: RECOMMENDED
-        SpoilingType: OPTIONAL
-        SpoilingRFPhaseIncrement: OPTIONAL
-        SpoilingGradientMoment: OPTIONAL
-        SpoilingGradientDuration: OPTIONAL
+            recommended, but required if [PET](./09-positron-emission-tomography.md) data are present
+        MRAcquisitionType: recommended, but required for Arterial Spin Labeling
+        MTState: recommended
+        MTOffsetFrequency: optional
+        MTPulseBandwidth: optional
+        MTNumberOfPulses: optional
+        MTPulseShape: optional
+        MTPulseDuration: optional
+        SpoilingState: recommended
+        SpoilingType: optional
+        SpoilingRFPhaseIncrement: optional
+        SpoilingGradientMoment: optional
+        SpoilingGradientDuration: optional
 
 PETMRISequenceSpecifics:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - dataset.modalities contains "PET"
     fields:
-        NonLinearGradientCorrection: REQUIRED
+        NonLinearGradientCorrection: required
 
 ASLMRISequenceSpecifics:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "perf"
     fields:
-        MRAcquisitionType: REQUIRED
+        MRAcquisitionType: required
 
 MTParameters:
     selectors:
-    - sidecar.MTState == True
+    - sidecar contains "MTState"
+    - sidecar.MTState == "True"
     fields:
-        MTOffsetFrequency: RECOMMENDED
-        MTPulseBandwidth: RECOMMENDED
-        MTNumberOfPulses: RECOMMENDED
-        MTPulseShape: RECOMMENDED
-        MTPulseDuration: RECOMMENDED
+        MTOffsetFrequency: recommended
+        MTPulseBandwidth: recommended
+        MTNumberOfPulses: recommended
+        MTPulseShape: recommended
+        MTPulseDuration: recommended
 
 SpoilingType:
     selectors:
+    - sidecar contains "SpoilingState"
     - sidecar.SpoilingState == True
     fields:
-        SpoilingType: RECOMMENDED
+        SpoilingType: recommended
 
 SpoilingRF:
     selectors:
+    - sidecar contains "SpoilingType"
     - sidecar.SpoilingType in ["RF", "COMBINED"]
     fields:
-        SpoilingRFPhaseIncrement: RECOMMENDED
+        SpoilingRFPhaseIncrement: recommended
 
 SpoilingGradient:
     selectors:
+    - sidecar contains "SpoilingType"
     - sidecar.SpoilingType in ["GRADIENT", "COMBINED"]
     fields:
-        SpoilingGradientMoment: RECOMMENDED
-        SpoilingGradientDuration: RECOMMENDED
+        SpoilingGradientMoment: recommended
+        SpoilingGradientDuration: recommended
 
 MRISpatialEncoding:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
-        NumberShots: RECOMMENDED
-        ParallelReductionFactorInPlane: RECOMMENDED
-        ParallelAcquisitionTechnique: RECOMMENDED
-        PartialFourier: RECOMMENDED
-        PartialFourierDirection: RECOMMENDED
+        NumberShots: recommended
+        ParallelReductionFactorInPlane: recommended
+        ParallelAcquisitionTechnique: recommended
+        PartialFourier: recommended
+        PartialFourierDirection: recommended
         PhaseEncodingDirection:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                This parameter is REQUIRED if corresponding fieldmap data is present
+                This parameter is required if corresponding fieldmap data is present
                 or when using multiple runs with different phase encoding directions
                 (which can be later used for field inhomogeneity correction).
             issue:
@@ -124,9 +128,9 @@ MRISpatialEncoding:
                 issue: |
                     You have to define 'PhaseEncodingDirection' for this file.
         EffectiveEchoSpacing:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                <sup>2</sup> This parameter is REQUIRED if corresponding fieldmap data
+                <sup>2</sup> This parameter is required if corresponding fieldmap data
                 is present.
             issue:
                 name: EFFECTIVE_ECHO_SPACING_NOT_DEFINED
@@ -134,9 +138,9 @@ MRISpatialEncoding:
                     You should define 'EffectiveEchoSpacing' for this file. If you don't
                     provide this information field map correction will not be possible.
         TotalReadoutTime:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                <sup>3</sup> This parameter is REQUIRED if corresponding 'field/distortion' maps
+                <sup>3</sup> This parameter is required if corresponding 'field/distortion' maps
                 acquired with opposing phase encoding directions are present
                 (see [Case 4: Multiple phase encoded
                 directions](#case-4-multiple-phase-encoded-directions-pepolar)).
@@ -144,16 +148,16 @@ MRISpatialEncoding:
                 name: TOTAL_READOUT_TIME_MUST_DEFINE
                 message: |
                     You have to define 'TotalReadoutTime' for this file.
-        MixingTime: RECOMMENDED
+        MixingTime: recommended
 
 MRITimingParameters:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
         EchoTime:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                REQUIRED if corresponding fieldmap data is present,
+                required if corresponding fieldmap data is present,
                 or the data comes from a multi-echo sequence or Arterial Spin Labeling.
             issue:
                 name: ECHO_TIME_NOT_DEFINED
@@ -167,39 +171,40 @@ MRITimingParameters:
                     The data type array provides a value for each volume in a 4D dataset and
                     should only be used when the volume timing is critical for interpretation
                     of the data, such as in ASL or variable echo time fMRI sequences.
-        InversionTime: RECOMMENDED
+        InversionTime: recommended
         SliceTiming:
-            level: RECOMMENDED
+            level: recommended
             level_addendum: |
-                REQUIRED for sparse sequences that do not have the `DelayTime` field set,
+                required for sparse sequences that do not have the `DelayTime` field set,
                 and Arterial Spin Labeling with `MRAcquisitionType` set on `2D`.
-        SliceEncodingDirection: RECOMMENDED
-        DwellTime: RECOMMENDED
+        SliceEncodingDirection: recommended
+        DwellTime: recommended
 
 SliceTimingASL:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - datatype == "perf"
     - suffix in ["asl", "m0scan"]
+    - sidecar contains "MRAcquisitionType"
     - sidecar.MRAcquisitionType == "2D"
     fields:
-        SliceTiming: REQUIRED
+        SliceTiming: required
 
 # This is technically for sparse sequences only, but I don't know how to encode that.
 SliceTimingSparse:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     - sidecar contains "DelayTime"
     fields:
-        SliceTiming: REQUIRED
+        SliceTiming: required
 
 MRIRFandContrast:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
         FlipAngle:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if LookLocker is set to `true`.
+            level: recommended
+            level_addendum: required if LookLocker is set to `true`.
             issue:
                 name: LOOK_LOCKER_FLIP_ANGLE_MISSING
                 message: |
@@ -214,44 +219,45 @@ MRIRFandContrast:
                     in a 4D dataset and should only be used when the volume timing is
                     critical for interpretation of the data, such as in ASL or
                     variable flip angle fMRI sequences.
-        NegativeContrast: OPTIONAL
+        NegativeContrast: optional
 
 MRIFlipAngleLookLocker:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
+    - sidecar contains "LookLocker"
     - sidecar.LookLocker == True
     fields:
-        FlipAngle: REQUIRED
+        FlipAngle: required
 
 MRISliceAcceleration:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
-        MultibandAccelerationFactor: RECOMMENDED
+        MultibandAccelerationFactor: recommended
 
 MRIAnatomicalLandmarks:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
-        AnatomicalLandmarkCoordinates__mri: RECOMMENDED
+        AnatomicalLandmarkCoordinates__mri: recommended
 
 MRIEchoPlanarImagingAndB0Mapping:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
-        B0FieldIdentifier: RECOMMENDED
-        B0FieldSource: RECOMMENDED
+        B0FieldIdentifier: recommended
+        B0FieldSource: recommended
 
 MRIInstitutionInformation:
     selectors:
-    - modality == "MRI"
+    - modality == "mri"
     fields:
         InstitutionName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 0080 `InstitutionName`.
         InstitutionAddress:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 0081 `InstitutionAddress`.
         InstitutionalDepartmentName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 1040 `Institutional Department Name`.
diff --git a/src/schema/rules/sidecars/pet.yaml b/src/schema/rules/sidecars/pet.yaml
index 5ee41b1f23..6399eb5e69 100644
--- a/src/schema/rules/sidecars/pet.yaml
+++ b/src/schema/rules/sidecars/pet.yaml
@@ -2,182 +2,182 @@
 # PET common metadata fields
 PETScannerHardware:
     selectors:
-    - modality == "PET"
+    - modality == "pet"
     fields:
         Manufacturer:
-            level: REQUIRED
+            level: required
             description_addendum: Corresponds to DICOM Tag 0008, 0070 `Manufacturer`.
         ManufacturersModelName:
-            level: REQUIRED
+            level: required
             description_addendum: Corresponds to DICOM Tag 0008, 1090 `Manufacturers Model Name`.
         Units:
-            level: REQUIRED
+            level: required
             description_addendum: |
                 SI unit for radioactivity (Becquerel) should be used (for example, "Bq/mL").
                 Corresponds to DICOM Tag 0054, 1001 `Units`.
         InstitutionName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 0080 `InstitutionName`.
         InstitutionAddress:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 0081 `InstitutionAddress`.
         InstitutionalDepartmentName:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0008, 1040 `Institutional Department Name`.
         BodyPart:
-            level: RECOMMENDED
+            level: recommended
             description_addendum: Corresponds to DICOM Tag 0018, 0015 `Body Part Examined`.
 
 PETRadioChemistry:
     selectors:
-    - modality == "PET"
+    - modality == "pet"
     fields:
         TracerName:
-            level: REQUIRED
+            level: required
         TracerRadionuclide:
-            level: REQUIRED
+            level: required
         InjectedRadioactivity:
-            level: REQUIRED
+            level: required
         InjectedRadioactivityUnits:
-            level: REQUIRED
+            level: required
         InjectedMass:
-            level: REQUIRED
+            level: required
         InjectedMassUnits:
-            level: REQUIRED
+            level: required
         SpecificRadioactivity:
-            level: REQUIRED
+            level: required
         SpecificRadioactivityUnits:
-            level: REQUIRED
+            level: required
         ModeOfAdministration:
-            level: REQUIRED
+            level: required
         TracerRadLex:
-            level: RECOMMENDED
+            level: recommended
         TracerSNOMED:
-            level: RECOMMENDED
+            level: recommended
         TracerMolecularWeight:
-            level: RECOMMENDED
+            level: recommended
         TracerMolecularWeightUnits:
-            level: RECOMMENDED
+            level: recommended
         InjectedMassPerWeight:
-            level: RECOMMENDED
+            level: recommended
         InjectedMassPerWeightUnits:
-            level: RECOMMENDED
+            level: recommended
         SpecificRadioactivityMeasTime:
-            level: RECOMMENDED
+            level: recommended
         MolarActivity:
-            level: RECOMMENDED
+            level: recommended
         MolarActivityUnits:
-            level: RECOMMENDED
+            level: recommended
         MolarActivityMeasTime:
-            level: RECOMMENDED
+            level: recommended
         InfusionRadioactivity:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
+            level: recommended
+            level_addendum: required if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
         InfusionStart:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
+            level: recommended
+            level_addendum: required if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
         InfusionSpeed:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
+            level: recommended
+            level_addendum: required if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
         InfusionSpeedUnits:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
+            level: recommended
+            level_addendum: required if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
         InjectedVolume:
-            level: RECOMMENDED
-            level_addendum: REQUIRED if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
+            level: recommended
+            level_addendum: required if PETRadioChemistry.fields.ModeOfAdministration == 'bolus-infusion'
         Purity:
-            level: RECOMMENDED
+            level: recommended
 
-# PET Infusion conditionally REQUIRED entities
+# PET Infusion conditionally required entities
 EntitiesBolusMetadata:
     selectors:
-    - modality == 'PET'
+    - modality == "pet"
     - sidecar.ModeOfAdministration == 'bolus-infusion'
     fields:
         InfusionRadioactivity:
-            level: REQUIRED
+            level: required
         InfusionStart:
-            level: REQUIRED
+            level: required
         InfusionSpeed:
-            level: REQUIRED
+            level: required
         InfusionSpeedUnits:
-            level: REQUIRED
+            level: required
         InjectedVolume:
-            level: REQUIRED
+            level: required
 
 PETPharmaceuticals:
     selectors:
-    - modality == "PET"
+    - modality == "pet"
     fields:
         PharmaceuticalName:
-            level: RECOMMENDED
+            level: recommended
         PharmaceuticalDoseAmount:
-            level: RECOMMENDED
+            level: recommended
         PharmaCeuticalDoseUnits:
-            level: RECOMMENDED
+            level: recommended
         PharmaCeuticalDoseRegimen:
-            level: RECOMMENDED
+            level: recommended
         PharmaCeuticalDoseTime:
-            level: RECOMMENDED
+            level: recommended
         Anaesthesia:
-            level: OPTIONAL
+            level: optional
 
 PETTime:
     selectors:
-    - modality == "PET"
+    - modality == "pet"
     fields:
         TimeZero:
-            level: REQUIRED
+            level: required
         ScanStart:
-            level: REQUIRED
+            level: required
         InjectionStart:
-            level: REQUIRED
+            level: required
         FramesTimesStart:
-            level: REQUIRED
+            level: required
         FrameDuration:
-            level: REQUIRED
+            level: required
         InjectionEnd:
-            level: RECOMMENDED
+            level: recommended
         ScanDate:
-            level: DEPRECATED
+            level: deprecated
 
 PETReconstruction:
     selectors:
-    - modality == "PET"
+    - modality == "pet"
     fields:
         AcquisitionMode:
-            level: REQUIRED
+            level: required
         ImageDecayCorrected:
-            level: REQUIRED
+            level: required
         ImageDecayCorrectionTime:
-            level: REQUIRED
+            level: required
         ReconMethodName:
-            level: REQUIRED
+            level: required
         ReconMethodParameterLabels:
-            level: REQUIRED
+            level: required
         ReconMethodParameterUnits:
-            level: REQUIRED
+            level: required
         ReconMethodParameterValues:
-            level: REQUIRED
+            level: required
         ReconFilterType:
-            level: REQUIRED
+            level: required
         ReconFilterSize:
-            level: REQUIRED
+            level: required
         AttenuationCorrection:
-            level: REQUIRED
+            level: required
         ReconMethodImplementationVersion:
-            level: RECOMMENDED
+            level: recommended
         AttenuationCorrectionMethodReference:
-            level: RECOMMENDED
+            level: recommended
         ScaleFactor:
-            level: RECOMMENDED
+            level: recommended
         ScatterFraction:
-            level: RECOMMENDED
+            level: recommended
         DecayCorrectionFactor:
-            level: RECOMMENDED
+            level: recommended
         DoseCalibrationFactor:
-            level: RECOMMENDED
+            level: recommended
         PromptRate:
-            level: RECOMMENDED
+            level: recommended
         SinglesRate:
-            level: RECOMMENDED
+            level: recommended
diff --git a/src/schema/rules/tabular_data/eeg.yaml b/src/schema/rules/tabular_data/eeg.yaml
index ee987de4f7..742a6856ec 100644
--- a/src/schema/rules/tabular_data/eeg.yaml
+++ b/src/schema/rules/tabular_data/eeg.yaml
@@ -4,19 +4,22 @@ EEGChannels:
     - datatype == "eeg"
     - suffix == "channels"
     - extension == ".tsv"
-    initial_columns: [name__channels, type__eeg_channels, units]
+    initial_columns:
+    - name__channels
+    - type__eeg_channels
+    - units
     columns:
-        name__channels: REQUIRED
-        type__eeg_channels: REQUIRED
-        units: REQUIRED
-        description: OPTIONAL
-        sampling_frequency: OPTIONAL
-        reference: OPTIONAL
-        low_cutoff: OPTIONAL
-        high_cutoff: OPTIONAL
-        notch: OPTIONAL
-        status: OPTIONAL
-        status_descriptions: OPTIONAL
+        name__channels: required
+        type__eeg_channels: required
+        units: required
+        description: optional
+        sampling_frequency: optional
+        reference: optional
+        low_cutoff: optional
+        high_cutoff: optional
+        notch: optional
+        status: optional
+        status_descriptions: optional
     additional_columns: allowed_if_defined
 
 EEGElectrodes:
@@ -24,13 +27,17 @@ EEGElectrodes:
     - datatype == "eeg"
     - suffix == "electrodes"
     - extension == ".tsv"
-    initial_columns: [name__electrodes, x, y, z]
+    initial_columns:
+    - name__electrodes
+    - x
+    - y
+    - z
     columns:
-        name__electrodes: REQUIRED
-        x: REQUIRED
-        y: REQUIRED
-        z: REQUIRED
-        type__electrodes: RECOMMENDED
-        material: RECOMMENDED
-        impedance: RECOMMENDED
+        name__electrodes: required
+        x: required
+        y: required
+        z: required
+        type__electrodes: recommended
+        material: recommended
+        impedance: recommended
     additional_columns: allowed_if_defined
diff --git a/src/schema/rules/tabular_data/ieeg.yaml b/src/schema/rules/tabular_data/ieeg.yaml
index faa968f160..36bde71c54 100644
--- a/src/schema/rules/tabular_data/ieeg.yaml
+++ b/src/schema/rules/tabular_data/ieeg.yaml
@@ -4,20 +4,23 @@ iEEGChannels:
     - datatype == "ieeg"
     - suffix == "channels"
     - extension == ".tsv"
-    initial_columns: [name__channels, type__ieeg_channels, units]
+    initial_columns:
+    - name__channels
+    - type__ieeg_channels
+    - units
     columns:
-        name__channels: REQUIRED
-        type__ieeg_channels: REQUIRED
-        units: REQUIRED
-        low_cutoff: REQUIRED
-        high_cutoff: REQUIRED
-        reference: OPTIONAL
-        group: OPTIONAL
-        sampling_frequency: OPTIONAL
-        description: OPTIONAL
-        notch: OPTIONAL
-        status: OPTIONAL
-        status_descriptions: OPTIONAL
+        name__channels: required
+        type__ieeg_channels: required
+        units: required
+        low_cutoff: required
+        high_cutoff: required
+        reference: optional
+        group: optional
+        sampling_frequency: optional
+        description: optional
+        notch: optional
+        status: optional
+        status_descriptions: optional
     additional_columns: allowed_if_defined
 
 iEEGElectrodes:
@@ -25,18 +28,22 @@ iEEGElectrodes:
     - datatype == "ieeg"
     - suffix == "electrodes"
     - extension == ".tsv"
-    initial_columns: [name__electrodes, x, y, z]
+    initial_columns:
+    - name__electrodes
+    - x
+    - y
+    - z
     columns:
-        name__electrodes: REQUIRED
-        x: REQUIRED
-        y: REQUIRED
-        z: REQUIRED
-        size: REQUIRED
-        material: RECOMMENDED
-        manufacturer: RECOMMENDED
-        group: RECOMMENDED
-        hemisphere: RECOMMENDED
-        type__electrodes: OPTIONAL
-        impedance: OPTIONAL
-        dimension: OPTIONAL
+        name__electrodes: required
+        x: required
+        y: required
+        z: required
+        size: required
+        material: recommended
+        manufacturer: recommended
+        group: recommended
+        hemisphere: recommended
+        type__electrodes: optional
+        impedance: optional
+        dimension: optional
     additional_columns: allowed_if_defined
diff --git a/src/schema/rules/tabular_data/meg.yaml b/src/schema/rules/tabular_data/meg.yaml
index f5bc01862a..ce364796cf 100644
--- a/src/schema/rules/tabular_data/meg.yaml
+++ b/src/schema/rules/tabular_data/meg.yaml
@@ -4,17 +4,20 @@ MEGChannels:
     - datatype == "eeg"
     - suffix == "channels"
     - extension == ".tsv"
-    initial_columns: [name__channels, type__meg_channels, units]
+    initial_columns:
+    - name__channels
+    - type__meg_channels
+    - units
     columns:
-        name__channels: REQUIRED
-        type__meg_channels: REQUIRED
-        units: REQUIRED
-        description: OPTIONAL
-        sampling_frequency: OPTIONAL
-        low_cutoff: OPTIONAL
-        high_cutoff: OPTIONAL
-        notch: OPTIONAL
-        software_filters: OPTIONAL
-        status: OPTIONAL
-        status_descriptions: OPTIONAL
+        name__channels: required
+        type__meg_channels: required
+        units: required
+        description: optional
+        sampling_frequency: optional
+        low_cutoff: optional
+        high_cutoff: optional
+        notch: optional
+        software_filters: optional
+        status: optional
+        status_descriptions: optional
     additional_columns: allowed_if_defined
diff --git a/src/schema/rules/tabular_data/pet.yaml b/src/schema/rules/tabular_data/pet.yaml
index 1960b34fd7..82e0059c22 100644
--- a/src/schema/rules/tabular_data/pet.yaml
+++ b/src/schema/rules/tabular_data/pet.yaml
@@ -5,46 +5,48 @@ Blood:
     - suffix == "blood"
     - extension == ".tsv"
     columns:
-        time: REQUIRED
-        plasma_radioactivity: OPTIONAL
-        metabolite_parent_fraction: OPTIONAL
-        metabolite_polar_fraction: OPTIONAL
-        hplc_recovery_fractions: OPTIONAL
-        whole_blood_radioactivity: OPTIONAL
+        time: required
+        plasma_radioactivity: optional
+        metabolite_parent_fraction: optional
+        metabolite_polar_fraction: optional
+        hplc_recovery_fractions: optional
+        whole_blood_radioactivity: optional
 
 BloodPlasma:
     selectors:
     - modality == "pet"
     - suffix == "blood"
     - extension == ".tsv"
-    - sidecar.PlasmaAvail
+    - sidecar contains "PlasmaAvail"
     columns:
-        plasma_radioactivity: REQUIRED
+        plasma_radioactivity: required
 
 BloodMetabolite:
     selectors:
     - modality == "pet"
     - suffix == "blood"
     - extension == ".tsv"
-    - sidecar.MetaboliteAvail
+    - sidecar contains "MetaboliteAvail"
     columns:
-        metabolite_parent_fraction: REQUIRED
-        metabolite_polar_fraction: RECOMMENDED
+        metabolite_parent_fraction: required
+        metabolite_polar_fraction: recommended
 
 BloodMetaboliteCorrection:
     selectors:
     - modality == "pet"
     - suffix == "blood"
     - extension == ".tsv"
+    - sidecar contains "MetaboliteRecoveryCorrectionApplied"
     - sidecar.MetaboliteRecoveryCorrectionApplied == true
     columns:
-        hplc_recovery_fractions: REQUIRED
+        hplc_recovery_fractions: required
 
 BloodWholeBlood:
     selectors:
     - modality == "pet"
     - suffix == "blood"
     - extension == ".tsv"
+    - sidecar contains "WholeBloodAvail"
     - sidecar.WholeBloodAvail == true
     columns:
-        whole_blood_radioactivity: REQUIRED
+        whole_blood_radioactivity: required

From ea25b43872d3444292a5229a35365ed6e8953c0d Mon Sep 17 00:00:00 2001
From: Chris Markiewicz <effigies@gmail.com>
Date: Fri, 15 Apr 2022 16:52:10 -0400
Subject: [PATCH 2/2] Apply suggestions from code review

---
 src/schema/rules/sidecars/eeg.yaml  | 4 ++--
 src/schema/rules/sidecars/ieeg.yaml | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/schema/rules/sidecars/eeg.yaml b/src/schema/rules/sidecars/eeg.yaml
index ec630cfcea..eb54527c81 100644
--- a/src/schema/rules/sidecars/eeg.yaml
+++ b/src/schema/rules/sidecars/eeg.yaml
@@ -19,7 +19,7 @@ EEGGeneric:
                 A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
-EEGrecommended:
+EEGRecommended:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
@@ -56,7 +56,7 @@ EEGRequired:
         PowerLineFrequency: required
         SoftwareFilters: required
 
-EEGMorerecommended:
+EEGMoreRecommended:
     selectors:
     - modality == "eeg"
     - datatype == "eeg"
diff --git a/src/schema/rules/sidecars/ieeg.yaml b/src/schema/rules/sidecars/ieeg.yaml
index 9f51287f3b..d7763546f3 100644
--- a/src/schema/rules/sidecars/ieeg.yaml
+++ b/src/schema/rules/sidecars/ieeg.yaml
@@ -19,7 +19,7 @@ iEEGGeneric:
                 A recommended convention is to name resting state task using labels
                 beginning with `rest`.
 
-iEEGrecommended:
+iEEGRecommended:
     selectors:
     - modality == "ieeg"
     - datatype == "ieeg"