Comment:

consider adding more parameters as recommendations (This list from MHD). I don't expect these all to be in US-Core, just wanted to clearly identify the gap:

• status - as it is often important to make clear the client is not interested in non-current entries

• date - as the publication date is sometimes known

• author - as sometimes the client knows who the author was

*category - category is a more query friendly due to the nature of a smaller grouping valueset

• setting - the practice setting from which the document came

• facility - the type of facility that published the document

• event - to find documents related to an event

• related - similarly to find documents related to an event id (e.g. assession)

• format - the specific type of technical format of the document

==> most pressing is category and status.

Summary:

Add search parameters to DocumentReference search