FHIR Extensibility Page

Context of the extension

The specification mentions a set of contexts of an extension. The spec is just a bit to terse to fully understand what they entail. So, below I have given my interpretation of them, as a candidate for extending the documentation:

• A particular element in a single resource - In instances, these extension elements can be found under the Resource.extensions element and refer to an element in the same resource (by use of id/idref, but we're going to change that?). Logically, this extension becomes a child element of that referenced element.

• Anywhere a particular data type is used
• A set of elements across one or more resources
• A particular context in one of the mapped reference models
• Another extension

(TODO: rest will follow, called into a meeting, sorry)