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:
<!ELEMENT p ANY>
Here is my "Hello world!" XML file linked to the external DTD file:
<!DOCTYPE p SYSTEM "hello.dtd">
- The DOCTYPE statement contains a key word "SYSTEM" to indicate that DTD
statements are included in an external DTD, followed by the DTD file name.
- The DTD file also contains the "xml" processing instruction as its first line.
- Obviously, the document type defined in this section is the same as the previous section.
Last update: 2014.
Table of Contents
About This Book
Introduction of XML (eXtensible Markup Language)
XML File Syntax
XML File Browsers
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
Syntaxes of DTD Statements
Validating an XML Document against the Specified DTD Document Type
XSD (XML Schema Definition) Introduction
Syntaxes of XSD Statements
Validating XML Documents Against Specified XML Schemas
XSL (Extensible Stylesheet Language) Introduction
XSLT (XSL Transformations) Introduction
Java Implementation of XSLT
XPath (XML Path) Language
XSLT Elements as Programming Statements
Control and Generate XML Element in the Result
XML Notepad - XML Editor
XML Tools Plugin for Notepad++
XML 1.1 Changes and Parsing Examples
PDF Printing Version