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Otherwise, the principal issues you need to consider are speed, size, and language binding (and other platform-related) issues.
Speed: If you're going to be parsing documents of only a few hundred elements, this is probably the least important concern.
If you're editing XML documents by hand rather than in a GUI-based editor, you need to check them for "correctness" before putting them to use.
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.Check out their website to get details on supported standards, reference documentation, etc.The XPath assertion applies a specified XPath expression to the received message and validates the resulting nodes against an expected value.You may find that you prefer one tool's error reporting format to another's. By the way, in theory you need to submit a given document to only one parser to ensure its "correctness." After all, the XML Recommendation is what it is, right?No wiggle room for interpreting a given chunk of code as correct or not, right?