‘Extending’ a ValueSet in a profile

In the last post we talked about ValueSets and CodeSystems – and in particular how the ValueSet can be thought of as the set of possible values from one or more CodeSystems for a particular element in a given context.

As you know, the spec provides ValueSets and bindings for all coded elements, and a common need when profiling is likely to be to ‘extend’ the set of possible values – take the contents already in the ValueSet and add others. What’s the best pattern to do that?

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