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3.4. Type Names and references to Types

Type Names are Qualified Names, made of a namespace and of a local name, as described in the former chapter.
Types names are used to (optionally) name Types, or to refer to another Type as a base type.
References to Types that are defined in the same Schema Document can be referred to with no prefix as well: the namespace is that of the defining Schema Document. If there is a collision with Builtin Type names, the locally defined Type has precedence (the Builtin Type is hidden).