Consider BIDS-compatibility / sidecar metadata.

[mslw]

Overview:

• BIDS specs for phenotypic and assessment data say that such data can be split into individual files (one per measurement tool, corresponding to our export_form), must be stored in a tsv file, may be accompanied by a json file describing columns in detail
• redcap-to-bids, a Python 2 script, seems to do at least part of the task
• REDCap API has an option to export metadata (data dictionary), and PyCap has an equivalent method. For an individual form, this outputs a sizeable json, which as far as I can see storesthe form definition. It doesn't match the BIDS one, but contains, among other, the field name and label (i.e. question text) for every question.

I don't have a formed assessment of how easy it would be to generate bids-like outputs. I leave two questions open:

• should the extension aim to support BIDS formatting & sidecar generation?
• if yes, should the sidecar be populated by the extension based on API queries, or should it be just a skeleton to be filled by users?