Allows discovery of existing questionnaires to be completed

Allows retrieval of a specific questionnaire by id. Allows systems to maintain a 'favorites' list of forms and retrieve them by id.

Allows review of changes made to a questionnaire over time. Of interest to some systems, but probably not most.

Allows retrieval of a historical version of a questionnaire. Most systems will make use of the current version only.

Allows retrieval of a specific value set by id (as referenced in a Questionnaire)

Allows retrieval of a specific version of a value set (as referenced in a Questionnaire)

Allows review of changes to a value set over time. Of interest to some systems, but probably not most.

Allows a user to search for existing completed or partially-completed forms. Generally used to find partially-completed forms for update.

Allows recording a completed or partially-completed form

Allows updating an existing completed or partially-completed form. (Systems may place rules on who can update forms and under what circumstances.)

Allows removal of a completed form from a repository. Note that the removal may be logical rather than physical. Some systems may have rules for who can remove a completed form and under what circumstances.

Allows review of prior versions of an answer set - allows reversion to previously recorded versions

Allows checking an answer set for validity against submission rules without persisting any data

Allows discovery of existing documents that may be included in a form pre-population request

Allows retrieval of a specific binary (as pointed to by a DocumentReference)

Allows retrieval of a historical version of a binary. In general, the most recent version would be appropriate, but some may prefer to use the specific version referenced by a DocumentReference.