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Quoting from the Oasis Standard, an XML Catalog... maps external identifiers and URI references to (other) URI references. It also defines a format for catalog entry files in terms of [XML] and [XML Namespaces]. A catalog is particularly useful for mapping well-know URIs for Schemas; a typical case are those for the Java EE Deployment Descriptors. This is very useful for performance reasons and required in disconnected mode. |
Norm was the editor for the Oasis standard and also provided a popular implementation that is included in GlassFish v2. Check out his latest writeup where he provides some background on the XML catalog and shows How to Use it.
