Validating It Without IE5

Although we've learned validating XML parsers (except the one in IE5) automatically validate XML, it is often useful to submit a document to one of the many XML validators. Next, we'll try one of the better ones by Richard Goerwitz which gives very detailed error messages. One advantage of a validation service is that it will not stop at the first error.

Some of these services permit checking well-formedness without validating the document. In other words, such services verify that the document follows the rules of XML syntax, but do not check the document against a DTD. Such services are therefore sometimes referred to as XML syntax checkers. An example of this type of checker is the XML well-formedness checker and validator, by Richard Tobin of the Language Technology Group at the University of Edinburgh.

XML Validation Form	Online interface; provide local file or URL of XML document to be validated. Supports NameSpaces by default, but this can be disabled. Tends to be verbose, but warnings can be suppressed. By Richard Goerwitz. You may be interested in reading the technical report, STG's XML 1.0 Reference Validator. See also WDVL's list of XML Checkers and Validation Services.
http://www.stg.brown.edu/service/xmlvalid/	Accepts either local XML document or URL as input. Requires a public DTD.

Since Richard Goerwitz's XML Validation Form requires a public DTD, the two examples we'll try are:

• Examples/collection1pubdtd.xml - references public DTD by URL
• Examples/collection1pubbugs.xml - invalid document with respect to public DTD

To Validate or Not To Validate
Doing It With XML, Part 1
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