Chapter 9. Using Regular Expressions to Specify Simple Datatypes
Among the many facets available for restricting simple datatypes, the
most flexible is based on regular expressions. The
pattern facet can be a last resort when all the
other facets are unable to express needed restrictions on a
user-defined datatype.
Warning
There is a terminology clash between RELAX NG’s
patterns and the pattern facet of W3C XML Schema.
To limit the risk of confusion, I refer to the facet as the
pattern facet or “regular
expression.”
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