Displaying Rich Text as XHTML
The section “Formatting Rich Text Data,” in Chapter 2, introduced you to XHTML. The W3C XHTML 1.0 The Extensible HyperText Markup Language (Second Edition) recommendation calls XHTML “a reformulation of HTML 4 as an XML 1.0 application.” The XHTML specification imposes a set of rules for expressing HTML4.01 content as a well-formed XML document. The most evident XHTML rule is this: HTML element and attribute tag names must be all lowercase (not camelCase). There is a growing trend among Web page authors to replace traditional capitalized tag names with lowercase versions in anticipation of moving to XHTML 1.0 or a later version.
see also
The W3C XHTML 1.0 recommendation, at www.w3.org/TR/xhtml1/, is an XHTML document ...
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