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5.4. Object facets

Restriction is done using the general facets, or the following object facets. For the moment, restriction can only be made on the topmost object type, but this will be relaxed later.
The object facets must fulfill the following consistency constraints against the super types (i.e., in the transitive closure of the $baseType relationship).
These constraints make sure that the new value space is a subset of the base type's value space.
Note: since currently, the $baseType must be "object", these constraints are always fulfilled.