Validating Against a DTD
How do you really know if your XML document is valid? One way is to check it with an XML validator, and there are plenty out there to choose from. As we saw in Chapter 1, validators are packages that will check your XML and give you feedback. Here's a list of some of the XML validators on the Web:
W3C XML validator (validator.w3.org/)— This is the official W3C HTML validator. Although it's officially for HTML, it also includes some XML support. Your XML document must be online to be checked with this validator.
Tidy (www.w3.org/People/Raggett/tidy/)— Tidy is a beloved utility for cleaning up and repairing Web pages, and it includes limited support for XML. Your XML document must be online to be checked with this validator. ...
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