XML Unleashed

Chapter 3. DTD Fundamentals

In This Chapter

• DTDs and Document Structure

• Understanding Elements and Attributes

• Working with Elements

• Working with Attributes

• Creating a Valid Document from a DTD

The Document Type Definition (DTD) forms the basis of valid documents because it establishes the grammar of an XML vocabulary, which in turn determines the structure of XML documents. A DTD is necessary for performing document validation, which is an important part of XML content development and deployment. Without knowing specifics about the elements declared for use in a document and the relationships between them, it is impossible to assess the validity of a document. Therefore, it is imperative that you use a DTD of some sort when creating valid documents. ...