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DTDs do not support XML namespaces well. The process by which DTDs are parsed does not enforce adherence to a namespace. As an alternative to DTDs, you can describe the XML document structure by using the World Wide Web Consortium (W3C) XML Schema language. This language offers the same benefits as DTDs, but also resolves some of the limitations of DTDs. DTDs are mainly useful when you are working with older XML applications that require DTDs and do not support XML schemas.
In some cases, you may want to reject XML messages that contain DTDs. For example, the SOAP 1.1 specification states that a SOAP message must not contain a DTD. Therefore, a SOAP processor can reject any SOAP message that contains a DTD. This update causes XML Web services that are built by using the SOAP Toolkit to reject the processing of XML messages that contain Document Type Definitions (DTDs).
Article ID: 827257 - Last Review: Aug 3, 2004 - Revision: 1