Inheritance: Further Relaxation allowing multiple files per directory

[yarikoptic]

Follow up/continuation to #1003 as suggested/discussed in #1003 (comment) . Extracting here:

For that latter case (e.g. task-rest_bold.json and acq-tricky_bold.json) we could have removed this requirement ("subsequent ... is a strict superset ...") and require that for such cases of unclear ordering, order is arbitrary but metadata files MUST NOT have identical metadata fields overloaded (thus order would not matter).

        if multiple applicable files have the same number of entities,
        they could be ordered arbitrarily among themselves and they MUST NOT
        contain overlapping metadata.

It would be up for validator to ensure adherence to such a principle. This would "relax" inheritance principle further and allow for arbitrary combinatorics if so desired for some studies, e.g. mix in of _task-rest_bold.json and ses-pilot_bold.json, _space-X and _desc-Y in bids-standard/bids-bep016#32 etc.

[Lestropie]

@yarikoptic Finally got around to this; see Lestropie#5.

[Remi-Gau]

• agree to start a separate thread because this sounds actionable
• maybe just me but I think that the rephrasing is just making more explicit what was in the original point 4.

[effigies]

Okay. New issue created. Will hide these posts.

[yarikoptic]

FWIW, this is inline with

• Replace "inheritance" with "summarization" principle bids-2-devel#65

and if implemented, would close this issue. With that in hope/mind - I would not bother addressing this for BIDS 1.0 since would require changes to tools etc, but would better be made more explicit in BIDS 2.0 formulation.