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- An XML look-alike for HTML defined by one of several XHTML DTDs. To use XHTML for everything would of course defeat the purpose of XML, because the idea of XML is to identify information content, and not just to tell how to display it. You can reference it in a DTD, which allows you to say, for example, that the text in an element can contain
<b>tags rather than being limited to plain text.
- CDATA, DTD, Entity, entity reference, external entity, external subset, local subset, prolog, Simple API for XML, tag