We had to change the Schema for DFDL Schemas so that it would tolerate non-native attributes (in order to fix DFDL-558).

This means the validator is no longer checking short form property bindings for correctness.

So we need to implement our own code so that every annotated schema component inspects any short-form properties on it, and checks that they are valid.

We can check some things centrally, i.e., is there a prefix bound to the DFDL namespace at all?

Stubs for this are in SchemaComponent.scala in the definition of AnnotatedSchemaComponent class.