ID and IDREF, NMTOKEN and NMTOKENS, Notation type, entities, internal versus external DTDs and public DTDs. ID represents a unique ID name for the attribute that identifies the element within the context of the document. IDs are much like internal links in plain HTML. For the most part, ID is used primarily by programs or scripting languages that process the document. The value for ID must be a valid XML name beginning with a letter and containing alphanumeric characters or the underscore character without any whitespace.
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