Should not return communities as sets

[pbinkley]

Problem: a request for identifiers or records in a set corresponding to a community returns no results. E.g. https://era.library.ualberta.ca/oai?verb=ListIdentifiers&metadataPrefix=oai_dc&set=44558r69g (which corresponds to https://era.library.ualberta.ca/collections/44558r69g).

Solution: do not report communities as sets. They can be distinguished from collections by the ualidentifier:is_community boolean flag in the Fedora object. The response to ListSets should include only the identifiers of collections.

This bug accounts for the refusal of the OAI registry at openarchives.org to register our OAI provider: when validating the oai service, it requests a list of sets, and then uses the first set in the list to validate the ListIdentifiers response. The first set in our list happens to be a community, so the response to ListIdentifiers contains no identifiers and is therefore invalid.

[jefferya]

In conversation with Weiwei:

• Fedora object "44558r69g" contained some weird properties, quoting Weiwei "... set to be a community, but it has a "belongsToCommunity" value, and there are several namespaces with is_community, and two of them are true, one of them is false". Once fixed OAI Open Archives' validation service proceeded.