I would really like the following definitions to be clearer because I can never remember which is logical and which is literal an inline key would be useful:

(http://hl7.org/fhir/valueset-reference-handling-policy.html)

literal Literal References ".... literal reference, in other words, when using Reference.reference..."

logical Logical References ".... logical reference, in other words, when using Reference.identifier..."

and clarify the meaning of or point the specs discussion of "The server will attempt to resolve logical references to literal references"