In several places we do and might further use grouping expressions like eg. 'create operations' to subsequently state some rule applicable for this class of 'operations'.
We should ensure, that the reader always finds a place, where she can lookup (at least typical) members of this classification and which are operationable i.e. real HTTP methods and such.

First Proposal was like:
Explain the higg level classifications like 'create operations' in terms of real HTTP methods and OData expectations somewhere in a good referenceable place.