Comment:

CapabilityStatement.rest.resource.searchParam

Implementations can choose to support singular or multiple criteria (implementing a logical AND or OR in search criteria) in some search parameters. For example: Condition?patient=a,b could be rejected (e.g., due to business rules about access to a single patient at a time in requests). It would be helpful for clients to understand which combinations would allow multiple references.

Summary:

Allow indication of whether AND and/or OR are supported