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Chapter 7. Union Types

7.1. Scope
7.2. Examples
7.3. Union facets

7.1. Scope

The value space of a Union Type is the union of the value spaces of all its member types.
There is no Builtin Union Type. All Union Types have directly the topmost "item" as their base type and restrict the value space by specifying the $content facet. General facets can also be used.