Assumed values are described in the ADL text, but are not currently included in the formal grammar specification of the cADL language.
Add assumed values to the grammar to support the described notion of it in the ADL and AOM
documents, i.e. a the leaf level only at the moment. Assumed values are supported for
primitive types, i.e. descendants of C_PRIMITIVE, and descendants of C_DOMAIN_TYPE. Test
archetypes have been modified to have assumed values. A new class QUANTITY has been added
to accommodate assumed value for C_QUANTITY.