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Real World XML by Steven Holzner

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3. Logical Structures

[Definition: Each XML document contains one or more elements, the boundaries of which are either delimited by start-tags and end-tags, or, for empty elements, by an empty-element tag. Each element has a type, identified by name, sometimes called its “generic identifier” (GI), and may have a set of attribute specifications.] Each attribute specification has a name and a value.

Element

					[39] element  ::= EmptyElemTag 
                  | STag content ETag      [WFC: Element Type Match]
                                           [VC: Element Valid]

This specification does not constrain the semantics, use, or (beyond syntax) names of the element types and attributes, except that names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future ...

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