Existing Wording
In addition to having a value as described above, these primitive data types can also have an identity (e.g. xml:id), and they may have extensions like any other element in a resource.

Proposed Wording
In addition to having a value as described above, elements using these primitive data types can also have an identity (e.g. xml:id), and they may have extensions like any other element in a resource.

Comments
The original statement sounds like the "data type" can have an id, but isn't it really a specific resource data element (e.g., Observation valueDateTime) that can have the id? I don't think the data type (e.g., timestamp) itself has an id, does it?

Grahame's Comments
yes, it does, but this could be clearer