XML in a Nutshell, 3rd Edition

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Name

Text from specification

Values of type ID must match the Name production. A name must not appear more than once in an XML document as a value of this type; i.e., ID values must uniquely identify the elements that bear them.

Explanation

No two attribute values for attributes declared as type ID can have the same value. This constraint is not restricted by element type, but it is global across the entire document.

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