Non-normative references are references to external documents or resources that
        implementers of DITA might find useful.
        
        
            
                - [CSS 2.1]
 
                - 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.
 
            
            
                - [XHTML 1.0]
 
                - 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.
 
            
            
                - [XHTML 1.1]
 
                - M. Altheim and S. McCarron, editors, XHTML 1.1 - Module-based
                    XHTML, http://www.w3.org/TR/xhtml11/, W3C Recommendation, 31 May 2001.
 
            
            
                - [XPointer 1.0]
 
                - 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.
 
            
            
                - [XLIFF 1.2]
 
                - OASIS Standard, XLIFF Version 1.2, 1 February 2008, http://docs.oasis-open.org/xliff/xliff-core/xliff-core.html.
 
            
            
                - [xml:tm 1.0]
 
                - 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.
 
            
            
                - [XQuery 1.0]
 
                - 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.
 
            
            
                - [XSL 1.0]
 
                - 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.
 
            
            
                - [XSL 1.1]
 
                - A. Berglund, editor, Extensible Stylesheet Language (XSL) Version
                        1.1, http://www.w3.org/TR/xsl11/, W3C Recommendation, 05 December
                    2006
 
            
            
                - [XSLT 1.0]
 
                - J. Clark, editor, XSL Transformations (XSLT) Version 1.0, http://www.w3.org/TR/xslt, W3C Recommendation, 16 November 1999
 
            
            
                - [XSLT 2.0]
 
                - M. Kay, editor, XSL Transformations (XSLT) Version 2.0, http://www.w3.org/TR/xslt20/, W3C Recommendation, 23 January
                    2007
 
            
            
                - [XTM 1.0]
 
                - 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.