XML Schema Complete Reference, The

10.4. Concepts and Observations

Creating a simple type is easy. Nonetheless, there are a few things to consider when creating a new simple type. This section covers adding constraining facets to simple types, noting the lack of non-instantiable simple types, specifying the scope of simple types, and blocking of simple types.

Each simple type has a value space and a lexical space. Furthermore, every value in the value space has a canonical lexical representation. This section covers these concepts.

10.4.1. Constraining Facets

The Schema Recommendation limits the use of constraining facets to simple types. Constraining facets enforce additional restrictions to a simple type derived directly or indirectly from a built-in datatype.

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