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Brain Imaging Data Structure (BIDS) Specification

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![th-3473881070](https://user-images.githubusercontent.com/950524/187348414-74fee159-858c-48cc-b3e8-db059d6c2119.jpg) `bidsschematools.render` imports Pandas and `bidsschematools.render.utils` includes a lot of functions which operate on dataframes. While we have [moved pandas to optional dependency status](https://github.com/bids-standard/bids-specification/blob/0ba6eac18629702d20f5a83643c45c8b428edd99/tools/schemacode/setup.cfg#L23-L36) and smart package managers will even...

enhancement
schema-code
dependencies

While attempting to add validation rules for BIDS Derivatives, we've found there is room for differences of interpretation in https://bids-specification.readthedocs.io/en/latest/05-derivatives/01-introduction.html (source included below) https://github.com/bids-standard/bids-specification/blob/73d9968b55ce9b87371522d7efa8cda57978e705/src/05-derivatives/01-introduction.md#L14-L71 To operationalize these, I see the...

derivatives
opinions wanted

### Your idea @TheChymera would prefer to use [argh](https://argh.readthedocs.io/en/latest/) over [click](https://click.palletsprojects.com/). I have no opinion except that I don't want to do it myself.

enhancement
schema-code

Closes #593 and possibly closes #1141. The problem that this PR attempts to address is that the definition of "modality" in Common Principles conflicts with its use in the schema....

opinions wanted
discussion
schema
schema-structure

The following were not completed in #1225 1) [qMRI appendix](https://bids-specification.readthedocs.io/en/stable/99-appendices/11-qmri.html#metadata-requirements-for-qmri-maps) 2) [Tabular files](https://bids-specification.readthedocs.io/en/stable/02-common-principles.html#tabular-files) - this is probably going to need to be a subobject table instead of a sidecar table...

schema
maintenance

In #568 we created a new appendix with the entity definitions. Whenever the entities are referenced in the text, a hyperlink is used to point to the appropriate section of...

consistency

This PR proposes that we use object keys (i.e., the unique keys of the dictionaries in the object schema files) as our primary object identifiers in the rule schema files....

bug
discussion
schema
schema-code
exclude-from-changelog

In case anyone tries to run `pre-commit run -a` you will get a failure on this file. https://github.com/bids-standard/bids-specification/blob/master/tools/schemacode/bidsschematools/tests/data/broken_dataset_description.json Odds that this will be an issue with a normal use of...

Some folks (myself included) are interested in adding common imaging model derivatives (especially GLM outputs) to the specification. [`fitlins`](https://github.com/poldracklab/fitlins) currently writes out files with a number of entities and suffixes...

derivatives
BEP

In BIDS 1.3, EEG had ``` sub-[_ses-][_acq-][_run-]_electrodes.tsv ``` and iEEG had ``` sub-[_ses-][_space-]_electrodes.tsv ``` As of 1.5, presumably due to schema stuff, they both became ``` sub-[_ses-][_acq-][_space-]_electrodes.tsv ``` So EEG...

iEEG
EEG
schema