Which of the following is NOT among the five common features of all resources?

• A. A URL that identifies the resource
• B. Common metadata
• C. A human-readable XHTML summary
• D. A version history log

Answer: (D)

In FHIR, every resource carries elements that support identification, provenance, and human understanding. A URL that identifies the resource is part of how clients refer to or locate the resource, and common metadata (the meta element) captures versioning hints and security tags. There is also a human-readable narrative in XHTML (the text element) that provides a concise, human-friendly summary of what the resource represents.

The thing that is not a built-in, always-present feature of every resource is a version history log. The history of a resource—earlier versions and changes—exists on the server and is accessed via a separate history endpoint (for example, requesting the resource history). It isn’t stored as a single, universal field inside the resource payload itself. The current version is indicated by the versionId in the metadata, but the full log of past versions is not a mandatory, embedded feature of the resource.