XML Tutorials - Herong's Tutorial Examples - v5.25, by Herong Yang
XML Files with Linked External DTD Files
This section provides a tutorial example on how to store DTD statements in an external file, which can be then linked to XML files. The external DTD file should also have the 'xml' process instruction.
DTD File: A text file that contains DTD statements that define elements, attributes and entities of a document type for XML files.
Instead of including DTD statements inside an XML file, we can also store DTD statements in a DTD file, and link the DTD file to the XML file.
Here is a DTD file, hello.dtd, for my "hello.xml" file:
<?xml version="1.0"?> <!ELEMENT p ANY>
Here is my "Hello world!" XML file linked to the external DTD file:
<?xml version="1.0"?> <!DOCTYPE p SYSTEM "hello.dtd"> <p>Hello world!</p>
Note that:
Table of Contents
Introduction of XML (eXtensible Markup Language)
DOM (Document Object Model) Programming Interface
SAX (Simple API for XML) Programming Interface
►DTD (Document Type Definition) Introduction
What Is DTD (Document Type Definition)
XML Files with Embedded DTD Statements
►XML Files with Linked External DTD Files
Validating an XML File against a DTD Document Type
Validating an XML Document against the Specified DTD Document Type
XSD (XML Schema Definition) Introduction
Validating XML Documents Against Specified XML Schemas
XSL (Extensible Stylesheet Language) Introduction
XSLT (XSL Transformations) Introduction
XSLT Elements as Programming Statements
Control and Generate XML Element in the Result
PHP Extensions for XML Manipulation
Processing XML with Python Scripts
XML Tools Plugin for Notepad++
XML Plugin Packages for Atom Editor