19.5. Document Type Definitions (DTDs)
Document Type Definitions (DTDs) are one of two main types of documents you can use to specify XML document structure. Section 19.6 presents W3C XML Schema documents, which provide an improved method of specifying XML document structure.
Software Engineering Observation 19.2
| XML documents can have many different structures, and for this reason an application cannot be certain whether a particular document it receives is complete, ordered properly, and not missing data. DTDs and schemas (Section 19.6) solve this problem by providing an extensible way to describe XML document structure. Applications should ... |
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