14.3. Constraining Simple Content
Most of this chapter discusses the syntax of a regular expression. The link to XML schemas is that either a simple type or a complex type constrained to simple content may specify a regular expression. The value of a pattern constraining facet is a regular expression. Note that the pattern constraining facet applies only to certain base types (see the discussion on built-in datatypes in Chapter 12).
Caution
The interaction between two pattern constraining facets specified by the same simple type is different than the interaction between two pattern constraining facets when one is specified by the base type and one by the derived type. See this section and Section 14.3 for clarification.
The remainder of this ...
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