Existing Wording: The US Core Client SHOULD:

Support fetching and querying of one or more US Core profile(s), using the supported RESTful interactions and search parameters declared in the US Core Server CapabilityStatement.

Proposed Wording: The US Core Client SHALL:

Support fetching and querying of one or more US Core profile(s), using the supported RESTful interactions and search parameters declared in the US Core Server CapabilityStatement.

Comment:

why is this only a SHOULD? This seems to be best said as a SHALL. Otherwise a client can claim to be conformant by just implementing the security requirements. Is that really what is intended?

Summary:

Make client query support of at least one resource mandatory