Non-normative references are references to external documents or resources that implementers of DITA might find useful.
Contents of this topic based on suggestions made on the e-mail list by Eliot Kimber, Seth Park, and Bruce Nevin. This topic must be reviewed. Here also are suggestions that I did not include:
B. Bos, T. Çelik, I. Hickson, and H.W. Lie, editors, Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification, http://www.w3.org/TR/CSS2/, W3C Candidate Recommendation, 08 September 2009.
W3C HTML Working Group, XHTML 1.0 The Extensible HyperText Markup Language (Second Edition): A Reformulation of HTML 4 in XML 1.0, http://www.w3.org/TR/xhtml1/, W3C Recommendation, 26 January 2000, revised 1 August 2002.
M. Altheim and S. McCarron, editors, XHTML 1.1 - Module-based XHTML, http://www.w3.org/TR/xhtml11/, W3C Recommendation, 31 May 2001.
S. DeRose, E. Maler, and R. Daniel Jr., editors, XML Pointer Language (XPointer) Version 1.0, http://www.w3.org/TR/WD-xptr, W3C Last Call Working Draft, 8 January 2001.
OASIS Standard, XLIFF Version 1.2, 1 February 2008, http://docs.oasis-open.org/xliff/xliff-core/xliff-core.html.
A. Zydroń, R. Raya, and B. Bogacki, editors, XML Text Memory (xml:tm) 1.0 Specification, http://www.lisa.org/fileadmin/standards/xml-tm.html, The Localization Industry Standards Association (LISA) xml:tm 1.0, 26 February 2007.
S. Boag, D. Chamberlin, M. F. Fernández, D. Florescu, J. Robie, and J. Siméon, editors, XQuery 1.0: An XML Query Language, http://www.w3.org/TR/xquery/, W3C Recommendation, 23 January 2007.
S. Adler, A. Berglund, J. Caruso, S. Deach, T. Graham, P. Grosso, E. Gutentag, A. Milowski, S. Parnell, J. Richman, and S. Zilles, Extensible Stylesheet Language (XSL) Version 1.0, http://www.w3.org/TR/2001/REC-xsl-20011015/, W3C Recommendation, 15 October 2001.
A. Berglund, editor, Extensible Stylesheet Language (XSL) Version 1.1, http://www.w3.org/TR/xsl11/, W3C Recommendation, 05 December 2006
J. Clark, editor, XSL Transformations (XSLT) Version 1.0, http://www.w3.org/TR/xslt, W3C Recommendation, 16 November 1999
M. Kay, editor, XSL Transformations (XSLT) Version 2.0, http://www.w3.org/TR/xslt20/, W3C Recommendation, 23 January 2007
S. Pepper and G. Moore, editors, XML Topic Maps (XTM) 1.0, http://www.topicmaps.org/xtm/index.html, TopicMaps.Org XTM 1.0, 2001.