dandi metadata: How should I link dandiset and asset meta-data in RDF

[surchs]

I got the JSON-LD meta-data for a number of dandisets from the API. Let's say I want to find dandisets that are about "Medial Temporal Lobe" and for these count the number of participants with sex=="Male". I think that the first is a dandiset level question, the second is an asset level question.

I can get the assets for a dandiset from the API and convert them with reproschema to JSON-LD or something similar. For dandiset 000004 example IDs will look like this:

dandiset: DANDI:000004/draft where DANDI resolves to http://dandiarchive.org/dandiset/
asset: dandiasset:38304fe9-5f37-4c0d-a741-9cf2bafab9ff where dandiasset resolves to http://dandiarchive.org/asset/

Since neither contains the other's ID anywhere I think that when I feed them into my triple store they will be two unconnected graphs. What would be the intended way to connect them in a way that would allow me to answer the above question?

[satra]

we are adding a little collection file on publish (this just got merged), and we would be doing something similar in pushing draft metadata to a triplestore.

here is the relevant issue: dandi/dandi-archive#399

you could temporarily, do the same for any assets you download. here is the relevant code in the api: https://github.com/dandi/dandi-api/blob/627eb4d617a9158c610cb59a0d4cb307833367ca/dandiapi/api/manifests.py#L93

effectively this information is there when you retrieve all the assets through the assets endpoint of a dandiset. also the metadata you receive from the api server for any asset or dandiset should already be jsonld, so you should not technically need to do any conversion.

[surchs]

Ah great, that is exactly what I'd need. I'll use your code example with hasMember to link them up for my local graph instance. Will this relationship (hasMember) eventually become part of the dandischema or is this going to be stored in collections.jsonld? In the latter case, what's the recommended way to get this file?

[satra]

don't know a good answer to that right this minute. probably will create an optional property for dandiset.