Chapter 16. Essential XHTML
Probably the biggest XML application today is XHTML, which is W3C's implementation of HTML 4.0 in XML. XHTML is a true XML application, which means that XHTML documents are XML documents that can be checked for well-formedness and validity.
There are two big advantages to using XHTML. First, HTML predefines all its elements and attributes, and that's not something you can change—unless you use XHTML. Because XHTML is really XML, you can extend it with your own elements, and we'll see how to do that in the next chapter. Need <INVOICE>, <DELIVERY_DATE>, and <PRODUCT_ID> elements in your Web page? Now you can add them. (This aspect of XHTML isn't supported by the major browsers yet, but it's coming.) The other big advantage, ...
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