XML by Example

The DTD Syntax

The syntax for DTDs is different from the syntax for XML documents.

Listing 3.1 is the address book introduced in Chapter 2 but with one differ-

ence: It has a new <!DOCTYPE> statement. The new statement is introduced

in the section “Document Type Declaration.” For now, it suffices to say that

it links the document file to the DTD file. Listing 3.2 is its DTD.

Listing 3.1: An Address Book in XML

<?xml version=”1.0”?>

<!DOCTYPE address-book SYSTEM “address-book.dtd”>

<!-- loosely inspired by vCard 3.0 -->

<address-book>

<entry>

<name>John Doe</name>

<address>

<street>34 Fountain Square Plaza</street>

<region>OH</region>

<postal-code>45202</postal-code> ...