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Your application then installs a resolver, whose job it is to consult the catalog whenever an external resource is needed.
The Apache xml-commons project's Resolver package, from Norman Walsh, is a collection of Java classes for working with XML Catalogs.
(It is worth noting as an aside that the DTD may be retrieved even if the parser is not validating, as this part of the XML spec explains.) For some applications this might not be a problem, but others might not have the luxury of a permanent net connection -- a J2ME Connected Limited Device Configuration, for instance.
Even if a net connection is available it might be slow, causing the page checker to be unacceptably slow; or the resource might not be available (if W3C's site is down), causing the page checker to break.
XML Catalogs offer a way to manage local copies of public DTDs, schemas, or indeed any XML resource that exists outside of the referring XML instance document.
Rather than modifying the XML instance document to refer directly to a local copy, you leave the reference to the remote resource and write an XML Catalog that maps remote references to local resources.
A catalog is made up of one or more catalog entry files.However, using an absolute path is best avoided since it restricts the portability of your application.Web applications, for instance, should be written in such a way as not to depend on where they are deployed on the filesystem, as this is typically out of their control.Here's a sample XHTML page to be checked: SAXParser Factory factory = SAXParser Instance(); Namespace Aware(true); Validating(true); SAXParser parser = SAXParser(); XMLReader reader = XMLReader(); Error Handler(new Default Error Handler()); reader.parse(input Source); that prints warnings to standard error, and throws exceptions when errors or fatal errors occur during parsing.Since the parser is validating the XHTML document against the declared DOCTYPE, it will retrieve the DTD from W3C's site at