Target sample use cases

Obviously no search engine is complete if it can't search for trivial keyword/names matching, so my first test is always to search for `Haxby` e.g. here is results on
- datalad-registry http://registry.datalad.org/overview/?filter=haxby&sort=update-desc
- google dataset search https://datasetsearch.research.google.com/search?src=0&query=haxby

;-)

But then on the other end of spectrum could be very specific and detailed use-cases which might require either elaborate metadata schemas, or use-case specific processing/derivatives computation/extraction/harmonization.

- For DANDI from @djarecka : https://docs.google.com/document/d/1YqhB8WXyf-Zb-Q_XVhWmmjOxjY8VwQHQTwI7Tm8mCkE/edit#heading=h.iljlekfyt6zk - metadata of interest but no target "questions"
- For @repronim collated IIRC with @dnkennedy at some point for DataLad: https://github.com/datalad/datalad/issues/2257
- @repronim's @dnkennedy use case of finding "source data" for a already processed (fmriprep)/shared (s3://fcp-indi/data/Projects/ABIDE/Outputs/fmriprep/) subject data.

Might be of interest (as evolves) for @fangq