In general, a webservice request is of the form:
/ws/2/entity/id?inc=stuff_to_include
However, for some reason to request the releases in a collection the request is of the form:
/ws/2/collection/collectionid/releases
Wouldn't it be better if the 'releases' bit weren't required, or if it were:
/ws/2/collection/collectionid?inc=releases