XHTML Versions
As you see in the <!DOCTYPE> element, I'm using the XHTML DTD that's called "XHTML 1.0 Transitional". That's only one of the XHTML DTDs available, although it's currently the most popular one. So, what XHTML DTDs are available, and what do they mean? That all depends on what version of XHTML that you are using.
XHTML Version 1.0
The standard version of XHTML, version 1.0, is just a rewrite of HTML 4.0 in XML. You can find the W3C recommendation for XHTML 1.0 at http://www.w3.org/TR/xhtml1. Essentially, it's just a set of DTDs that provide validity checks for documents that are supposed to mimic HTML 4.0 (actually, HTML 4.01). The W3C has created several DTDs for HTML 4.0, and the XHTML DTDs are based on those, translated into ...
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