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Sun's implementation supports any combination of configuration options.(If a combination is not supported by a particular implementation, it is required to generate a factory configuration error.) Although a full treatment of XML Schema is beyond the scope of this tutorial, this section shows you the steps you take to validate an XML document using an existing schema written in the XML Schema language.Validating parsers also can use information from the DTD to provide extra capabilities, such as entity substitution and attribute defaulting.(Note: Any parser that validates will also check for well-formedness.(To learn more about XML Schema, you can review the online tutorial, Note: There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.

You need to understand about two things about the validating parser at the outset: .

Even so, I think you need to keep your head on straight about speed -- if you're serving XML documents over the Web, even a few seconds' difference in parsing speed is going to be the least of your problems. The faster a parser is, the more likely that its code is tighter and its size (and, of course, feature set) is smaller. Let's say you're planning to serve XML documents via a Perl-based CGI application.

In the grand tradition of Perlians throughout history, you will of course use an existing parser -- say, XML:: Parser -- rather than writing your own.

Do you want the parser to supply an attribute's default value if the document author hasn't done so? In such cases, you can eliminate whole sub-categories of non-validating parsers from consideration.

Otherwise, the principal issues you need to consider are speed, size, and language binding (and other platform-related) issues.

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