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[ENH] Clarify that data files must be uniquely identified by entities/suffix #1508

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Jun 15, 2023
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[ENH] Clarify that data files must be uniquely identified by entities/suffix #1508

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a180a83
[MISC] clarify duplications with different extensions are not permitted
sappelhoff Jun 2, 2023
1368a0f
ENH: Reword section to discuss uniqueness of data files
effigies Jun 6, 2023
a677bfd
Merge remote-tracking branch 'upstream/master' into dupes
effigies Jun 6, 2023
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12 changes: 12 additions & 0 deletions src/common-principles.md
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Expand Up @@ -196,6 +196,18 @@ as the labels would collide on a case-insensitive filesystem.
Additionally, because the suffix `eeg` is defined,
then the suffix `EEG` will not be added to future versions of the standard.

## No duplicate files under different file extensions

BIDS datasets MUST NOT contain identical data under different extensions.
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For example if the files

- `sub-01_ses-01_sample-A_photo.jpg` and
- `sub-01_ses-01_sample-A_photo.tif`

contain a representation of the same data,
then the dataset curator MUST decide for one of the two extensions
and delete the other file from the BIDS dataset.

## Filesystem structure & Filenames richness versus distinctness

BIDS provides a rich filesystem structure and rich filenames by using entities, but it is important to keep in mind that files also have to be readable.
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