XML in a Nutshell, 3rd Edition

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Name

xs:IDREF

Synopsis

xs:IDREF is a subtype of xs:NCName, with the additional restriction that the value is used elsewhere in the instance document on an item with type xs:ID. The legal lexical values of type xs:IDREF are exactly the same as for xs:NCName. Constraining facets that apply to xs:IDREF are length, minLength, maxLength, pattern, enumeration, and whiteSpace.

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