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Right here (http://www.w3.org/TR/REC-xml). Includes the EBNF. There are also versions in Japanese (http://www.fxis.co.jp/DMS/sgml/xml/); Spanish (http://www.ucc.ie/xml/faq-es.html); Korean (http://xml.t2000.co.kr/faq/index.html) and a Java-ised annotated version at http://www.xml.com/axml/testaxml.htm.
