XML Files with Embedded DTD Statements

XML Tutorials - Herong's Tutorial Examples

∟DTD (Document Type Definition) Introduction

∟XML Files with Embedded DTD Statements

This section provides a tutorial example on how to include DTD statements inside XML files. Embedded DTD statements should appear after the 'xml' process instruction and before the root element.

The easiest way to associate a document type to an XML file is to include all DTD statements that define the document type inside the XML file.

Here is my "Hello world!" XML file with DTD statements embedded internally, hello_int_dtd.xml:

<?xml version="1.0"?>
<!DOCTYPE p [
 <!ELEMENT p ANY>
]>
<p>Hello world!</p>

Note that:

A document type (DOCTYPE) declaration statement is added right below the "xml" process instruction.
The DOCTYPE statement specifies that "p" is the name of the root element.
The DOCTYPE statement specifies that all other DTD statements are enclosed in this statement enclosed by "[" and "]".
Only one other DTD statement used here, which is an ELEMENT statement. It specifies that the "p" element can have "ANY" thing as its body.
Obviously, the XML document below DTD statements is valid against the defined document type.