19.6. W3C XML Schema Documents
In this section, we introduce schemas for specifying XML document structure and validating XML documents. Many developers in the XML community believe that DTDs are not flexible enough to meet today’s programming needs. For example, DTDs lack a way of indicating what specific type of data (e.g., numeric, text) an element can contain and DTDs are not themselves XML documents. These and other limitations have led to the development of schemas.
Unlike DTDs, schemas do not use EBNF grammar. Instead, schemas use XML syntax and are actually XML documents that programs can manipulate. Like DTDs, schemas are used by validating parsers to validate documents.
In this section, we focus on the W3C’s XML Schema vocabulary (note ...
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