Responses are all arrays unless id? about proxi-schemas

[ypriverol]

@edeutsch this is actually a problem in all the other endpoints created by the ambiguity of the USI and the lack of identifiers for PSMs, Peptides, and Proteins. I will vote for not removing the dataset/{accession} endpoint because we would like to have a page in the future like this http://proteomecentral.proteomexchange.org/cgi/GetDataset?ID=PXD010597 returning only one dataset.

[edeutsch]

sorry, I was too vague in my report.
I fully agree that /datasets/{identifier} should be a singular Dataset returned
But I note that plain /datasets returns an array of Dataset objects. This is also fine
BUT, the issue is the /spectra does not return an array of spectra. but I think it should.
and /psms does not return an array of psms. but I think it should.
and /peptides does not .... etc.
I believe we agreed in Tokyo that all endpoints performing queries (this excludes /xxx/{identifier}) should return an array of items. Did we not?

[ypriverol]

sorry, I was too vague in my report.
I fully agree that /datasets/{identifier} should be a singular Dataset returned
But I note that plain /datasets returns an array of Dataset objects. This is also fine
BUT, the issue is the /spectra does not return an array of spectra. but I think it should.
and /psms does not return an array of psms. but I think it should.
and /peptides does not .... etc.
I believe we agreed in Tokyo that all endpoints performing queries (this excludes /xxx/{identifier}) should return an array of items. Did we not?

@edeutsch I miss array definition, already included in the current PR #42

[edeutsch]

I think this is resolved. All endpoints return and array of items except for /xxx/{identifier} is the policy.