David Cleary

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XML application development will take a big leap forward with the impending release of the XML Schema Description Language (XSDL) as a W3C Recommendation. XSDL goes far beyond what's offered today by DTDs with the addition of XML datatypes, namespace support, and inheritance mechanisms. However, features you require may not have made it into the language. For this reason XSDL contains two methods for adding application-specific information directly to a schema. The first, the element, allows you to associate any structured content with most XSDL elements. The second is a lesser-known feature called foreign namespaced attributes (FNAs). These are attributes declared outside the XSDL namespace that can be placed within any XSDL element without affecting validation. Why Extend XML Schema? There are many reasons for extending an XML Schema. XSDL validates an XML... (more)