Flavours of XHTML
The XHTML standard is defined by three different DTDs. One DTD defines the strict XHTML core standard. There is also a 'transitional' DTD that is closer to the current HTML standard, and should be phased out over time. Finally, the third DTD covers frame features. Frame-building elements are treated separately because frames are used to create the infrastructure of a Web site, rather than a document.
Identifying XHTML documents
The three parts or versions of XHTML must include a DOCTYPE declaration, with a public identifier that matches one of the following strings:
-//W3C//DTD XHTML 1.0 Strict//EN -//W3C//DTD XHTML 1.0 Transitional//EN -//W3C//DTD XHTML 1.0 Frameset//EN
A system identifier is still needed to reference the ...
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