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[6] J. Clark. RELAX NG Compact Syntax. OASIS. 2002. URL: http://relaxng.org/compact-20021121.html.
[7] RELAX NG Compact Syntax Tutorial. OASIS. 2003. URL: http://relaxng.org/compact-tutorial-20030326.html.
[8] XML Schema Part 0: Primer. W3C. 2001. URL: http://www.w3.org/TR/xmlschema-0/.
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[14] Relax NG. O'Reilly. 2003. ISBN 0-596-00421-4. URL: http://books.xmlschemata.org/relaxng/page2.html.