XML Unleashed

Summary

This chapter explored the basics of XML data modeling and the two approaches used to describe the structure of XML documents: DTDs and XML Schema. These two data modeling approaches are generally referred to as schemas, a term borrowed from the database world. A schema describes the arrangement of markup and character data within a valid XML document. Schemas aren't required to create well-formed XML documents, but they are absolutely essential for creating valid documents. DTDs originated in SGML and serve as the standard schema mechanism for validating SGML documents. XML Schema is a technology created by Microsoft that is a partial implementation of the XML-Data working draft in the W3C. Although XML Schemas have much more to offer ...