Using Catalog Files
The details of how to load a catalog file when processing a document vary from parser to parser and tool to tool. Not all XML processors support catalogs, but most of the important ones do. The Gnome Project's xsltproc, Michael Kay's Saxon, and the XML Apache Project's Xerces-J and Xalan-J all support catalogs. Notably lacking from this list are the C++ versions of Xerces and Xalan as well as Microsoft's MSXML. Of course, it isn't hard to integrate catalog processing into your own applications with just a little bit of open source code.
libxml2
Daniel Veillard's libxml2 XML parser for C supports catalogs, as does his libxslt processor that sits on top of libxml2. libxml2 reads the catalog location from the XML_CATALOG_FILES ...
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