Modeling Data with XML Schemas
XML Schema is a new approach to defining the schema for XML documents that uses an XML vocabulary called XML-Data. As of this writing, XML-Data is at the working draft stage in the W3C, which means that a formal recommendation will hopefully follow soon. Microsoft was eager to offer an alternative to DTDs and decided to support a subset of the XML-Data working draft in Internet Explorer 5.0. This subset of XML-Data is what Microsoft is calling XML Schema.
An XML Schema is very similar in purpose to a DTD, in that it is used to establish the schema of a class of XML documents. Like DTDs, XML Schemas describe elements and their content models so that documents can be validated. However, XML Schemas go several steps ...
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