Existing Wording: If the value set already has an expansion (e.g., a stored expansion):

Check that the parameters associated with the $expand operation are consistent with the parameters recorded in the expansion

If the parameters are inconsistent, then either generate a new composition, or, if there is no definition (.compose), return an error

Comment:

Parameter is an element in expansion, not compose. Should composition be expansion?

Summary:

Parameter is an element in expansion, not compose. Should composition be expansion?