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generated.tex
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% -------------------------------------------
% Items to substitute into the ivoatex document template.
%
%\ivoagroup{Data Model Working Group}
%\title{Common Archive Observation Model}
%\author{Patrick Dowler}
%\author{Canadian Astronomy Data Centre}
% -------------------------------------------
\pagebreak
\section{Model: caom2 }
% INSERT FIGURE HERE
%\begin{figure}[h]
%\begin{center}
% \includegraphics[width=\textwidth]{????.png}
% \caption{???}\label{fig:????}
%\end{center}
%\end{figure}
a general purpose data model for use as the core data model of an astronomical data centre
\subsection{Algorithm}
\label{sect:Algorithm}
the algorithm that was responsible for creating the observation; for a DerivedObservation this is the algorithm that defines the intended set of members to include
\subsubsection{Algorithm.name}
\textbf{vodml-id: Algorithm.name} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
common name of the algorithm; the value 'exposure' is reserved for use in SimpleObservation; TBD: publish a list of acceptable values as a machine-readable vocabulary?
\subsection{Artifact}
\label{sect:Artifact}
a physical product (typically a file)
\subsubsection{Artifact.uri}
\textbf{vodml-id: Artifact.uri} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 1} \newline
an identifier that resolves to the storage location of the artifact
\subsubsection{Artifact.productType}
\textbf{vodml-id: Artifact.productType} \newline
\textbf{type: \hyperref[sect:DataLinkSemantics]{caom2:DataLinkSemantics}} \newline
\textbf{multiplicity: 1} \newline
the relationship of this Artifact to the parent Plane (DataLink semantics)
\subsubsection{Artifact.releaseType}
\textbf{vodml-id: Artifact.releaseType} \newline
\textbf{type: \hyperref[sect:ReleaseType]{caom2:ReleaseType}} \newline
\textbf{multiplicity: 1} \newline
field indicating how access permissions for this artifact are determined
\subsubsection{Artifact.contentType}
\textbf{vodml-id: Artifact.contentType} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
label specifying the format of the resolved artifact; typically a MIME-type
\subsubsection{Artifact.contentLength}
\textbf{vodml-id: Artifact.contentLength} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
the size of the resolved artifact; typically file size in bytes
\subsubsection{Artifact.contentChecksum}
\textbf{vodml-id: Artifact.contentChecksum} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
the checksum of the artifact data; the URI must conform to the pattern {algorithm}:{value}, for example: md5:4be91751541fd804e7207663a0822f56 (NEW in CAOM-2.3)
\subsubsection{Artifact.contentRelease}
\textbf{vodml-id: Artifact.contentRelease} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp after which content for the plane is public (new in CAOM-2.4); if set, this value overrides the permission implied by the releaseType and Plane release dates
\subsubsection{Artifact.contentReadGroups}
\textbf{vodml-id: Artifact.contentReadGroups} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
list of groups (of users) that are allowed to access the content of this artifact; this is applicable when the effective release date is null or in the future (new in CAOM-2.4)
\subsubsection{Artifact.descriptionID}
\textbf{vodml-id: Artifact.descriptionID} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
identifier for an ArtifactDescription entity (new in CAOM-2.5)
\subsubsection{Artifact.parts}
\textbf{vodml-id: Artifact.parts} \newline
\textbf{type: \hyperref[sect:Part]{caom2:Part}} \newline
\textbf{multiplicity: 0..*} \newline
the component parts of this artifact
\subsection{ArtifactDescription}
\label{sect:ArtifactDescription}
shared and referenceable description of an artitfact (NEW in CAOM-2.5)
\subsubsection{ArtifactDescription.uri}
\textbf{vodml-id: ArtifactDescription.uri} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 1} \newline
logical identifier for this description
\subsubsection{ArtifactDescription.description}
\textbf{vodml-id: Artifact.description} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
description of an artifact
\subsection{CaomEntity (Abstract)}
\label{sect:CaomEntity}
base CAOM entity class to support accumulated metadata checkcums and lastModified timestamps to support synchronisation
\subsubsection{CaomEntity.maxLastModified}
\textbf{vodml-id: CaomEntity.maxLastModified} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
maximum timestamp of last modification of this entity and all child entities; the timestamp is intended to be applied or updated when the entity is stored (e.g. in a database)
\subsubsection{CaomEntity.accMetaChecksum}
\textbf{vodml-id: CaomEntity.accMetaChecksum} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
accumulated checksum of the metadata of this entity and all child entities; (NEW in CAOM-2.3) The URI must conform to the pattern {algorithm}:{value}, for example: md5:4be91751541fd804e7207663a0822f56. The accumulated checksum of an entity is computed by accumulating the byte representation of entity checksums in the following order: (1) the metaChecksum of the current entity, (2) the accMetaChecksum of all child entities accumulated in order of the child's Entity.id. For an entity with no children, the accMetaChecksum is derived only from the metaChecksum but it is not equal to it because it is a checksum of that checksum and not a checksum of the same metadata directly.
\subsection{Chunk}
\label{sect:Chunk}
a quantitatively defined subsection of a data array; the part contains the whole array
\subsubsection{Chunk.productType}
\textbf{vodml-id: Chunk.productType} \newline
\textbf{type: \hyperref[sect:DataLinkSemantics]{caom2:DataLinkSemantics}} \newline
\textbf{multiplicity: 0..1} \newline
the relationship of this Artifact to the parent Plane (DataLink semantics)
\subsubsection{Chunk.naxis}
\textbf{vodml-id: Chunk.naxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
number of axes in the data array; value must be in [1,7] since CAOM supports a maximum of seven axes; furthermore, if naxis has a value, the axis index values 1 to {naxis} must be assigned (to positionAxis1, positionAxis2, energyAxis, timeAxis, polarizationAxis, customAxis, and/or observableAxis) and each axis index value assigned to those fields must be unique; axis index values above {naxis} may be assigned in order to preserve the ordering of metadata-only WCS (see FITS-WCS WCSAXES defintion for an example of how this could originate and be used)
\subsubsection{Chunk.positionAxis1}
\textbf{vodml-id: Chunk.positionAxis1} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the first position axis; if set: positionAxis2 and position must also have values
\subsubsection{Chunk.positionAxis2}
\textbf{vodml-id: Chunk.positionAxis2} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the second position axis; if set: positionAxis1 and position must also have values
\subsubsection{Chunk.energyAxis}
\textbf{vodml-id: Chunk.energyAxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the energy axis; if set: energy must have a value
\subsubsection{Chunk.timeAxis}
\textbf{vodml-id: Chunk.timeAxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the time axis; if set: time must have a value
\subsubsection{Chunk.polarizationAxis}
\textbf{vodml-id: Chunk.polarizationAxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the polarization axis; if set: polarization must have a value
\subsubsection{Chunk.customAxis}
\textbf{vodml-id: Chunk.customAxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the custom axis; if set: custom must have a value
\subsubsection{Chunk.observableAxis}
\textbf{vodml-id: Chunk.observableAxis} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
index of the observable axis; if set: observable must have a value
\subsubsection{Chunk.position}
\textbf{vodml-id: Chunk.position} \newline
\textbf{type: \hyperref[sect:SpatialWCS]{caom2:SpatialWCS}} \newline
\textbf{multiplicity: 0..1} \newline
spatial WCS description of the data array or subsection thereof; if positionAxis1 and positionAxis2 indices are null or have values above {naxis}, then the spatial WCS is metadata only (usually the degenerate case of one spatial pixel)
\subsubsection{Chunk.energy}
\textbf{vodml-id: Chunk.energy} \newline
\textbf{type: \hyperref[sect:SpectralWCS]{caom2:SpectralWCS}} \newline
\textbf{multiplicity: 0..1} \newline
spectral WCS description of the data array or subsection thereof; if energyAxis index is null or has a value above {naxis}, then the spectral WCS is metadata only (usually the degenerate case of one spectral pixel)
\subsubsection{Chunk.time}
\textbf{vodml-id: Chunk.time} \newline
\textbf{type: \hyperref[sect:TemporalWCS]{caom2:TemporalWCS}} \newline
\textbf{multiplicity: 0..1} \newline
temporal WCS description of the data array or subsection thereof; if timeAxis index is null or has a value above {naxis}, then the time WCS is metadata only (usually the degenerate case of one time pixel for the whole data array)
\subsubsection{Chunk.polarization}
\textbf{vodml-id: Chunk.polarization} \newline
\textbf{type: \hyperref[sect:PolarizationWCS]{caom2:PolarizationWCS}} \newline
\textbf{multiplicity: 0..1} \newline
polarization WCS description of the data array or subsection thereof; if polarizationAxis index is null or has a value above {naxis}, then the polarization WCS is metadata only (usually the degenerate case of one polarization pixel)
\subsubsection{Chunk.custom}
\textbf{vodml-id: Chunk.custom} \newline
\textbf{type: \hyperref[sect:CustomWCS]{caom2:CustomWCS}} \newline
\textbf{multiplicity: 0..1} \newline
custom WCS description of the data array or subsection thereof; if customAxis index is null or has a value above {naxis}, then the custom WCS is metadata only (usually the degenerate case of one custom pixel)
\subsubsection{Chunk.observable}
\textbf{vodml-id: Chunk.observable} \newline
\textbf{type: \hyperref[sect:ObservableAxis]{caom2:ObservableAxis}} \newline
\textbf{multiplicity: 0..1} \newline
observable description of the data array or subsection thereof; if observableAxis index is null or has a value above {naxis}, then the observable axis is metadata only (usually the degenerate case of one observable for the whole data array)
\subsection{CustomAxis}
\label{sect:CustomAxis}
description of a custom coordinate axis (new in CAOM-2.4)
\subsubsection{CustomAxis.ctype}
\textbf{vodml-id: CustomAxis.ctype} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
coordinate type code
\subsubsection{CustomAxis.bounds}
\textbf{vodml-id: CustomAxis.bounds} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 1} \newline
custom coordinate coverage (cardinality changed in CAOM-2.5)
\subsubsection{CustomAxis.samples}
\textbf{vodml-id: CustomAxis.samples} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 1..*} \newline
detailed custom coordinate coverage (refactored in CAOM-2.5)
\subsubsection{CustomAxis.dimension}
\textbf{vodml-id: CustomAxis.dimension} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
number of discrete samples (pixels) along custom axis
\subsection{DataLinkSemantics}
\label{sect:DataLinkSemantics}
term from the DataLink Core vocabulary (CHANGED from ProductType enumeration in CAOM-2.5)
\subsection{DataProductType}
\label{sect:CalibrationStatus}
term from the IVOA calibration-status vocabulary; this vocabulary does not yet exist but can be created using optional terms in the ObsCore standard (NEW in CAOM-2.5)
\subsection{DataProductType}
\label{sect:DataProductType}
term from the IVOA product-type vocabulary (CHANGED from CAOM DataProductType vocabulary based on ObsCore in CAOM-2.5)
\subsection{DataQuality}
\label{sect:DataQuality}
description of the data quality
\subsubsection{DataQuality.flag}
\textbf{vodml-id: DataQuality.flag} \newline
\textbf{type: \hyperref[sect:Quality]{caom2:Quality}} \newline
\textbf{multiplicity: 1} \newline
flag indicating the data quality
\subsection{DerivedObservation}
\label{sect:DerivedObservation}
an observation derived from one or more observations (name and intent changed in CAOM-2.4)
\subsubsection{DerivedObservation.members}
\textbf{vodml-id: DerivedObservation.members} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
members are the observations grouped together by the algorithm that defines the derivation; these are the intended components of the composite product -- actual inputs are described by the provenance; members may be simple or derived observations (arbitrary heirarchy); a derived observation made by combining multiple observations is equivalent to a composite observation (CAOM-2.3 and older); derived observations with one or more members may be defined such that they only include a subset of each member (they are extracted from the progenitor)
\subsection{Energy}
\label{sect:Energy}
description of the energy coverage and sampling of the data
\subsubsection{Energy.bounds}
\textbf{vodml-id: Energy.bounds} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 1} \newline
simple outer bounds of energy coverage of the data (cardinality changed in CAOM-2.5)
\subsubsection{Energy.samples}
\textbf{vodml-id: Energy.samples} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 1..*} \newline
detailed energy coverage of the data (refactored in CAOM-2.5)
\subsubsection{Energy.energyBands}
\textbf{vodml-id: Energy.energyBands} \newline
\textbf{type: \hyperref[sect:EnergyBand]{caom2:EnergyBand}} \newline
\textbf{multiplicity: 0..*} \newline
standard name of the energy regime(s) included in the data (attribute name and cardinality changed in CAOM-2.4)
\subsubsection{Energy.dimension}
\textbf{vodml-id: Energy.dimension} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
number of measurements (pixels) on the energy axis
\subsubsection{Energy.resolvingPower}
\textbf{vodml-id: Energy.resolvingPower} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
mean spectral resolving power per pixel (relative resolution)
\subsubsection{Energy.resolvingPowerBounds}
\textbf{vodml-id: Energy.resolvingPowerBounds} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 0..1} \newline
range of resolving power within the bounds (relative resolution)
\subsubsection{Energy.resolution}
\textbf{vodml-id: Energy.resolution} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
mean absolute spectral resolution per pixel (new in CAOM-2.5)
\subsubsection{Energy.resolutionBounds}
\textbf{vodml-id: Energy.resolutionBounds} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 0..1} \newline
range of absolute spectral resolution within the bounds (new in CAOM-2.5)
\subsubsection{Energy.sampleSize}
\textbf{vodml-id: Energy.sampleSize} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
mean pixel size
\subsubsection{Energy.bandpassName}
\textbf{vodml-id: Energy.bandpassName} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..*} \newline
telescope- and instrument-specific name for the energy band(s) included; multiple bands may be included if energies from all specified bands are included in the data (in the sense of union)
\subsubsection{Energy.transition}
\textbf{vodml-id: Energy.transition} \newline
\textbf{type: \hyperref[sect:EnergyTransition]{caom2:EnergyTransition}} \newline
\textbf{multiplicity: 0..1} \newline
target energy transition for this data
\subsubsection{Energy.restwav}
\textbf{vodml-id: Energy.rest} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
rest energy of the target energy transition (name changed in CAOM-2.5)
\subsubsection{Energy.calibration}
\textbf{vodml-id: Energy.calibration} \newline
\textbf{type: \hyperref[sect:CalibrationStatus]{caom2:CalibrationStatus}} \newline
\textbf{multiplicity: 0..1} \newline
term describing the calibration of the energy axis values (new in CAOM-2.5)
\subsection{Entity (Abstract)}
\label{sect:Entity}
base entity class to support persistence; entity attributes are generally set or updated by persistence implementations
\subsubsection{Entity.id}
\textbf{vodml-id: Entity.id} \newline
\textbf{type: \hyperref[sect:uuid]{caom2:uuid}} \newline
\textbf{multiplicity: 1} \newline
globally unique identifier (primary key)
\subsubsection{Entity.lastModified}
\textbf{vodml-id: Entity.lastModified} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp of last modification of this entity; the timestamp is intended to be applied or updated when the entity is stored (e.g. in a database)
\subsubsection{Entity.metaChecksum}
\textbf{vodml-id: Entity.metaChecksum} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
checksum of this entity; (NEW in CAOM-2.3) The URI must conform to the pattern {algorithm}:{value}, for example: md5:4be91751541fd804e7207663a0822f56. The checksum of an entity is computed by accumulating byte representation of individual metadata values in the following order: (1) CaomEntity.id for entities, (2) CaomEntity.metaProducer, (3) state fields in alphabetic order (foo.a comes before foo.b) and using depth-first recursion (foo.abc.x comes before foo.def). Null values are ignored so that the addition of new fields in future versions will not change/invalidate existing checksums until values are assigned. Non-null values are converted to bytes as follows. TODO: add digestFieldNames to algorithm string: UTF-8 encoded bytes URI: UTF-8 encoded bytes of string representation float: IEEE754 single (4 bytes) double: IEEE754 double (8 bytes) boolean: convert to single byte, false=0, true=1 (1 bytes) byte: as-is (1 byte) short: (2 bytes, network byte order == big endian)) integer: (4 bytes, network byte order == big endian) long: (8 bytes, network byte order == big endian) date: truncate time to whole number of seconds and treat as a long (seconds since 1970-01-01 00:00:00 UTC)
\subsubsection{Entity.metaProducer}
\textbf{vodml-id: Entity.metaProducer} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
identifier for the producer of this entity and child entities with null metaProducer; (NEW in CAOM-2.4) The URI should conform to the pattern {organisation}:{software name-version} (for example: cadc:cfht2caom2-1.1) and identifies the tools used to produce the metadata. This information is intended for use by operators to help diagnose metadata issues.
\subsection{Environment}
\label{sect:Environment}
collection of measured quantities that characterise the environment at the time of observation
\subsubsection{Environment.name}
\textbf{vodml-id: Environment.seeing} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
typical atmospheric distortion (full-width-half-max of a point source)
\subsubsection{Environment.humidity}
\textbf{vodml-id: Environment.humidity} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
fractional relative humidity [0,1]
\subsubsection{Environment.elevation}
\textbf{vodml-id: Environment.elevation} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
angular elevation above horizon [0,90]
\subsubsection{Environment.tau}
\textbf{vodml-id: Environment.tau} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
the opacity of the atmosphere [0,1]
\subsubsection{Environment.wavelengthTau}
\textbf{vodml-id: Environment.wavelengthTau} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
wavelength at which opacity was measured
\subsubsection{Environment.ambientTemp}
\textbf{vodml-id: Environment.ambientTemp} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
ambient temperature at the telescope
\subsubsection{Environment.photometric}
\textbf{vodml-id: Environment.photometric} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:boolean}} \newline
\textbf{multiplicity: 0..1} \newline
indicator that flux and/or color calibration is stable
\subsection{Instrument}
\label{sect:Instrument}
the instrument used to acquire or create the observation; this could be used for both physical instruments that acquire data or software that generates it (e.g. simulated data)
\subsubsection{Instrument.name}
\textbf{vodml-id: Instrument.name} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
common name for the instrument
\subsubsection{Instrument.keywords}
\textbf{vodml-id: Instrument.keywords} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..*} \newline
additional keywords that describe the instrument or instrument configuration at the time of observation; keywords cannot contain the pipe (|) character - it is reserved for use in persistence systems (e.g. to store all keywords in a single column in a table)
\subsection{Metrics}
\label{sect:Metrics}
collection of measured quantities that describe the content of the data
\subsubsection{Metrics.sourceNumberDensity}
\textbf{vodml-id: Metrics.sourceNumberDensity} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
number of sources detected per unit area
\subsubsection{Metrics.background}
\textbf{vodml-id: Metrics.background} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
background level
\subsubsection{Metrics.backgroundStddev}
\textbf{vodml-id: Metrics.backgroundStddev} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
standard deviation in the background level
\subsubsection{Metrics.fluxDensityLimit}
\textbf{vodml-id: Metrics.fluxDensityLimit} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
flux density with a signal:noise ratio of 10
\subsubsection{Metrics.magLimit}
\textbf{vodml-id: Metrics.magLimit} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
magnitude with a signal:noise ratio of 10
\subsubsection{Metrics.sampleSNR}
\textbf{vodml-id: Metrics.sampleSNR} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
signal:noise ratio for a representative subset of samples (new in CAOM-2.4)
\subsection{Observable}
\label{sect:Observable}
description of the sample (pixel) values
\subsubsection{Observable.ucd}
\textbf{vodml-id: Observable.ucd} \newline
\textbf{type: \hyperref[sect:UCD]{caom2:UCD}} \newline
\textbf{multiplicity: 1} \newline
Unified Content Descriptor (UCD) that says what kind of quantity is stored
\subsubsection{Observable.calibration}
\textbf{vodml-id: Observable.calibration} \newline
\textbf{type: \hyperref[sect:CalibrationStatus]{caom2:CalibrationStatus}} \newline
\textbf{multiplicity: 0..1} \newline
term describing the calibration of the observable values
\subsection{Observation (Abstract)}
\label{sect:Observation}
an observation is a single top-level entry in an astronomy data centre
\subsubsection{Observation.collection}
\textbf{vodml-id: Observation.collection} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
the name of the data collection this observation belongs to
\subsubsection{Observation.uri}
\textbf{vodml-id: Observation.uri} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 1} \newline
unique logical identifier for this observation (NEW in CAOM-2.5)
\subsubsection{Observation.metaRelease}
\textbf{vodml-id: Observation.metaRelease} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp after which metadata for the observation instance is public
\subsubsection{Observation.sequenceNumber}
\textbf{vodml-id: Observation.sequenceNumber} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
a collection-specific sequence number for observations; re-use or reset is collection specific
\subsubsection{Observation.type}
\textbf{vodml-id: Observation.type} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
the type of observation (FITS OBSTYPE keyword); usually OBJECT for intent = science
\subsubsection{Observation.intent}
\textbf{vodml-id: Observation.intent} \newline
\textbf{type: \hyperref[sect:ObservationIntentType]{caom2:ObservationIntentType}} \newline
\textbf{multiplicity: 1} \newline
the intent of the original observer in acquiring this data
\subsubsection{Observation.metaReadGroups}
\textbf{vodml-id: Observation.metaReadGroups} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
set of groups with read permission on observation metadata (new in 2.4)
\subsubsection{Observation.algorithm}
\textbf{vodml-id: Observation.algorithm} \newline
\textbf{type: \hyperref[sect:Algorithm]{caom2:Algorithm}} \newline
\textbf{multiplicity: 1} \newline
the algorithm or process that created this observation
\subsubsection{Observation.telescope}
\textbf{vodml-id: Observation.telescope} \newline
\textbf{type: \hyperref[sect:Telescope]{caom2:Telescope}} \newline
\textbf{multiplicity: 0..1} \newline
the telescope or facility where this observation was created
\subsubsection{Observation.instrument}
\textbf{vodml-id: Observation.instrument} \newline
\textbf{type: \hyperref[sect:Instrument]{caom2:Instrument}} \newline
\textbf{multiplicity: 0..1} \newline
the instrument or detector used to acquire the data
\subsubsection{Observation.environment}
\textbf{vodml-id: Observation.environment} \newline
\textbf{type: \hyperref[sect:Environment]{caom2:Environment}} \newline
\textbf{multiplicity: 0..1} \newline
the environmental conditions at the time of observation
\subsubsection{Observation.proposal}
\textbf{vodml-id: Observation.Proposal} \newline
\textbf{type: \hyperref[sect:Proposal]{caom2:Proposal}} \newline
\textbf{multiplicity: 0..1} \newline
the science proposal underwhich this observation was created
\subsubsection{Observation.target}
\textbf{vodml-id: Observation.target} \newline
\textbf{type: \hyperref[sect:Target]{caom2:Target}} \newline
\textbf{multiplicity: 0..1} \newline
the intended target of the observation
\subsubsection{Observation.targetPosition}
\textbf{vodml-id: Observation.targetPosition} \newline
\textbf{type: \hyperref[sect:TargetPosition]{caom2:TargetPosition}} \newline
\textbf{multiplicity: 0..1} \newline
the intended target position for this observation
\subsubsection{Observation.requirements}
\textbf{vodml-id: Observation.requirements} \newline
\textbf{type: \hyperref[sect:Requirements]{caom2:Requirements}} \newline
\textbf{multiplicity: 0..1} \newline
the observational requirements specified by the observer or proposal
\subsubsection{Observation.planes}
\textbf{vodml-id: Observation.planes} \newline
\textbf{type: \hyperref[sect:Plane]{caom2:Plane}} \newline
\textbf{multiplicity: 0..*} \newline
the component planes belonging to this observation
\subsection{Part}
\label{sect:Part}
format-specific name of this part; this is typically something like a FITS extension or a file within a container
\subsubsection{Part.name}
\textbf{vodml-id: Part.name} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
the name of this part of the artifact; this is typically something like a FITS extension name or number or a filename
\subsubsection{Part.productType}
\textbf{vodml-id: Part.productType} \newline
\textbf{type: \hyperref[sect:DataLinkSemantics]{caom2:DataLinkSemantics}} \newline
\textbf{multiplicity: 0..1} \newline
the relationship of this Artifact to the parent Plane (DataLink semantics)
\subsubsection{Part.chunks}
\textbf{vodml-id: Part.chunks} \newline
\textbf{type: \hyperref[sect:Chunk]{caom2:Chunk}} \newline
\textbf{multiplicity: 0..*} \newline
component chunks that belong to this part
\subsection{Plane}
\label{sect:Plane}
a component of an observation that describes one product of the observation
\subsubsection{Plane.uri}
\textbf{vodml-id: Plane.uri} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
unique logical identifier for this product; typically made by adding additional path component(s) to the Observation.uri (NEW in CAOM-2.5)
\subsubsection{Plane.metaRelease}
\textbf{vodml-id: Plane.metaRelease} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp after which metadata for the plane is public; this metaRelease timestamp applies to all children of the plane and to artifacts with releaseType=meta
\subsubsection{Plane.metaReadGroups}
\textbf{vodml-id: Plane.metaReadGroups} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
list of groups (of users) that are allowed to view the metadata of the plane; this is applicable when metaRelease is null or in the future (new in CAOM-2.4)
\subsubsection{Plane.dataRelease}
\textbf{vodml-id: Plane.dataRelease} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:datetime}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp after which data for the plane is public; this dataRelease timestamp applies to all children of the plane and to artifacts with releaseType=data
\subsubsection{Plane.dataReadGroups}
\textbf{vodml-id: Plane.dataReadGroups} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
list of groups (of users) that are allowed to access the data of the plane; this is applicable when dataRelease is null or in the future (new in CAOM-2.4)
\subsubsection{Plane.calibrationLevel}
\textbf{vodml-id: Plane.calibrationLevel} \newline
\textbf{type: \hyperref[sect:CalibrationLevel]{caom2:CalibrationLevel}} \newline
\textbf{multiplicity: 0..1} \newline
standard classification of the degree to which the data is calibrated
\subsubsection{Plane.dataProductType}
\textbf{vodml-id: Plane.dataProductType} \newline
\textbf{type: \hyperref[sect:DataProductType]{caom2:DataProductType}} \newline
\textbf{multiplicity: 0..1} \newline
standard classification of the type of data product; describes the logical data type for the main artifacts
\subsubsection{Plane.observable}
\textbf{vodml-id: Plane.observable} \newline
\textbf{type: \hyperref[sect:Observable]{caom2:Observable}} \newline
\textbf{multiplicity: 0..1} \newline
description of the sample (pixel) values; (new in CAOM-2.4) In previous versions the observable was assumed to be flux or intensity of EM radiation.
\subsubsection{Plane.quality}
\textbf{vodml-id: Plane.quality} \newline
\textbf{type: \hyperref[sect:DataQuality]{caom2:DataQuality}} \newline
\textbf{multiplicity: 0..1} \newline
flag indicating the quality of the data
\subsubsection{Plane.metrics}
\textbf{vodml-id: Plane.metrics} \newline
\textbf{type: \hyperref[sect:Metrics]{caom2:Metrics}} \newline
\textbf{multiplicity: 0..1} \newline
collection of measured quantities that describe the content of the data
\subsubsection{Plane.position}
\textbf{vodml-id: Plane.position} \newline
\textbf{type: \hyperref[sect:Position]{caom2:Position}} \newline
\textbf{multiplicity: 0..1} \newline
description of the position(s) included in the data
\subsubsection{Plane.energy}
\textbf{vodml-id: Plane.energy} \newline
\textbf{type: \hyperref[sect:Energy]{caom2:Energy}} \newline
\textbf{multiplicity: 0..1} \newline
descritpion of the energy(ies) included in the data
\subsubsection{Plane.time}
\textbf{vodml-id: Plane.time} \newline
\textbf{type: \hyperref[sect:Time]{caom2:Time}} \newline
\textbf{multiplicity: 0..1} \newline
description of the time(s) included in the data
\subsubsection{Plane.polarization}
\textbf{vodml-id: Plane.polarization} \newline
\textbf{type: \hyperref[sect:Polarization]{caom2:Polarization}} \newline
\textbf{multiplicity: 0..1} \newline
description of the polarization(s) included in the data
\subsubsection{Plane.custom}
\textbf{vodml-id: Plane.custom} \newline
\textbf{type: \hyperref[sect:CustomAxis]{caom2:CustomAxis}} \newline
\textbf{multiplicity: 0..1} \newline
description of a custom coordinate axis in the data (new in CAOM-2.4); Since different custom coordinate types can be used with different planes, instances of CustomAxis can only be compared sensibly if they have the same coordinate type.
\subsubsection{Plane.uv}
\textbf{vodml-id: Plane.uv} \newline
\textbf{type: \hyperref[sect:Visibility]{caom2:Visibility}} \newline
\textbf{multiplicity: 0..1} \newline
[TODO add description!]
\subsubsection{Plane.provenance}
\textbf{vodml-id: Plane.provenance} \newline
\textbf{type: \hyperref[sect:Provenance]{caom2:Provenance}} \newline
\textbf{multiplicity: 0..1} \newline
description of the provenance of the data
\subsubsection{Plane.artifacts}
\textbf{vodml-id: Plane.artifacts} \newline
\textbf{type: \hyperref[sect:Artifact]{caom2:Artifact}} \newline
\textbf{multiplicity: 0..*} \newline
the component artifacts belonging to this plane
\subsection{Polarization}
\label{sect:Polarization}
description of polarization measurements included in the data
\subsubsection{Polarization.states}
\textbf{vodml-id: Polarization.states} \newline
\textbf{type: \hyperref[sect:PolarizationState]{caom2:PolarizationState}} \newline
\textbf{multiplicity: 1..*} \newline
standard polarization states included (cardinality changed in CAOM-2.5)
\subsubsection{Polarization.dimension}
\textbf{vodml-id: Polarization.dimension} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:integer}} \newline
\textbf{multiplicity: 0..1} \newline
number of polarization states included
\subsection{PolarizationState}
\label{sect:PolarizationState}
this class defines constants for the PolarizationState vocabulary (CHANGED from enumeration in CAOM-2.5)
\subsection{Position}
\label{sect:Position}
description of the position coverage and sampling of the data
\subsubsection{Position.bounds}
\textbf{vodml-id: Position.bounds} \newline
\textbf{type: \hyperref[sect:types.Shape]{caom2:types.Shape}} \newline
\textbf{multiplicity: 1} \newline
spatial boundary that includes the data (cardinality changed in CAOM-2.5)
\subsubsection{Position.samples}
\textbf{vodml-id: Position.samples} \newline
\textbf{type: \hyperref[sect:types.MultiShape]{caom2:types.MultiShape}} \newline
\textbf{multiplicity: 1} \newline
detailed sub-samples of the bounds (refactored in CAOM-2.5)
\subsubsection{Position.minBounds}
\textbf{vodml-id: Position.minBounds} \newline
\textbf{type: \hyperref[sect:types.Shape]{caom2:types.Shape}} \newline
\textbf{multiplicity: 0..1} \newline
minimum spatial boundary that includes the data; this value is smaller than the bounds (maximum) when the field-of-view varies because it is dependent on another axis (usually energy) (new in CAOM-2.5)
\subsubsection{Position.dimension}
\textbf{vodml-id: Position.dimension} \newline
\textbf{type: \hyperref[sect:Dimension2D]{caom2:Dimension2D}} \newline
\textbf{multiplicity: 0..1} \newline
number of separate measurements (pixels) along each axis
\subsubsection{Position.maxAngularScale}
\textbf{vodml-id: Position.maxAngularScale} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 0..1} \newline
maximum size of spatial structure (signal) that can be recovered or seen in the data (new in CAOM-2.5)
\subsubsection{Position.resolution}
\textbf{vodml-id: Position.resolution} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
mean spatial resolution (full-width-half-max) per pixel
\subsubsection{Position.resolutionBounds}
\textbf{vodml-id: Position.resolutionBounds} \newline
\textbf{type: \hyperref[sect:types.Interval]{caom2:types.Interval}} \newline
\textbf{multiplicity: 0..1} \newline
range of resolution within the bounds
\subsubsection{Position.sampleSize}
\textbf{vodml-id: Position.sampleSize} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
median pixel size
\subsubsection{Position.calibration}
\textbf{vodml-id: Position.calibration} \newline
\textbf{type: \hyperref[sect:CalibrationStatus]{caom2:CalibrationStatus}} \newline
\textbf{multiplicity: 0..1} \newline
term describing the calibration of the position axis values new in CAOM-2.5)
\subsection{Proposal}
\label{sect:Proposal}
description of the science proposal or programme that initiated the observation
\subsubsection{Proposal.proposalID}
\textbf{vodml-id: Proposal.proposalID} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
collection-specific identifier for the proposal
\subsubsection{Proposal.pi}
\textbf{vodml-id: Proposal.pi} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
proper name of the principal investigator
\subsubsection{Proposal.project}
\textbf{vodml-id: Proposal.project} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
common name of the project this proposal belongs to; typically used for larger or long-running projects that include mutliple proposals
\subsubsection{Proposal.title}
\textbf{vodml-id: Proposal.title} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
title of the proposal
\subsubsection{Proposal.keywords}
\textbf{vodml-id: Proposal.keywords} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..*} \newline
additional keywords that describe the science goals of the proposal; keywords cannot contain the pipe (|) character - it is reserved for use in persistence systems (e.g. to store all keywords in a single column in a table)
\subsubsection{Proposal.reference}
\textbf{vodml-id: Proposal.reference} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
identifier for external resource with proposal details
\subsection{Provenance}
\label{sect:Provenance}
description of how this data was produced
\subsubsection{Provenance.name}
\textbf{vodml-id: Provenance.name} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
collection-specific common name of the process
\subsubsection{Provenance.reference}
\textbf{vodml-id: Provenance.reference} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
identifier for external resource with proposal details
\subsubsection{Provenance.version}
\textbf{vodml-id: Provenance.version} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
version of the software or process that produced the data
\subsubsection{Provenance.project}
\textbf{vodml-id: Provenance.project} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
name of the project that produced the data; data produced in a uniform way are typically labelled with the same project name
\subsubsection{Provenance.producer}
\textbf{vodml-id: Provenance.producer} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
common name of the entity (person, institute, etc) responsible for producing the data
\subsubsection{Provenance.runID}
\textbf{vodml-id: Provenance.runID} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
collection-specific identifier for the processing instance that produced the data; this identifier can typcially be traced in log files or logging systems
\subsubsection{Provenance.lastExecuted}
\textbf{vodml-id: Provenance.lastExecuted} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..1} \newline
timestamp describing when this process last ran and produced data
\subsubsection{Provenance.keywords}
\textbf{vodml-id: Provenance.keywords} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..*} \newline
additional keywords that describe the processing; this may include both general descriptive words and those specific to this particular execution of the processing; keywords cannot contain the pipe (|) character - it is reserved for use in persistence systems (e.g. to store all keywords in a single column in a table)
\subsubsection{Provenance.inputs}
\textbf{vodml-id: Provenance.inputs} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..*} \newline
local identifier for input planes; these are the actual inputs that went into the product
\subsection{Quality}
\label{sect:Quality}
vocabulary term used in CAOM; this class defines constants for the CAOM Quality vocabulary (CHANGED from enumeration in CAOM-2.4)
\subsection{Requirements}
\label{sect:Requirements}
the observational requirements specified by the proposal
\subsubsection{Requirements.flag}
\textbf{vodml-id: Requirements.flag} \newline
\textbf{type: \hyperref[sect:Status]{caom2:Status}} \newline
\textbf{multiplicity: 1} \newline
flag indicating degree to which requirements were satisfied by the observation
\subsection{SimpleObservation}
\label{sect:SimpleObservation}
an observation created directly by operating an instrument or process
\subsection{Status}
\label{sect:Status}
vocabulary term used in CAOM; this class defines constants for the CAOM Status vocabulary (CHANGED from enumeration in CAOM-2.4)
\subsection{Target}
\label{sect:Target}
the target of an observation
\subsubsection{Target.name}
\textbf{vodml-id: Target.name} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 1} \newline
proper name of the target
\subsubsection{Target.targetID}
\textbf{vodml-id: Target.targetID} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:anyURI}} \newline
\textbf{multiplicity: 0..1} \newline
resolvable target identifier (new in CAOM-2.4); the targetID URI should be of the form {scheme}:{id} so it can be resolved (for example: naif:170100)
\subsubsection{Target.type}
\textbf{vodml-id: Target.type} \newline
\textbf{type: \hyperref[sect:TargetType]{caom2:TargetType}} \newline
\textbf{multiplicity: 0..1} \newline
type of target; typically used to figure out what the target name means and where to look for additional information about it
\subsubsection{Target.redshift}
\textbf{vodml-id: Target.redshift} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:real}} \newline
\textbf{multiplicity: 0..1} \newline
cosmological redshift of the target
\subsubsection{Target.standard}
\textbf{vodml-id: Target.standard} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:boolean}} \newline
\textbf{multiplicity: 0..1} \newline
indicates that the target is typically used as a standard (astrometric, photometric, etc)
\subsubsection{Target.moving}
\textbf{vodml-id: Target.moving} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:boolean}} \newline
\textbf{multiplicity: 0..1} \newline
indicates that the target is a moving object; used for solar system objects but not high proper motion stars
\subsubsection{Target.keywords}
\textbf{vodml-id: Target.keywords} \newline
\textbf{type: \hyperref[sect:ivoa]{ivoa:string}} \newline
\textbf{multiplicity: 0..*} \newline
additional keywords that describe the target; keywords cannot contain the pipe (|) character - it is reserved for use in persistence systems (e.g. to store all keywords in a single column in a table)
\subsection{TargetPosition}
\label{sect:TargetPosition}
the intended position of the observation (not the position of the intended or actual target)
\subsubsection{TargetPosition.coordsys}
\textbf{vodml-id: TargetPosition.coordsys} \newline