Testing DOM XML DTD Validator

This section provides a tutorial example on how to test the DOM XML DTD Validator. All errors are generated with line numbers and explanations.

To test the DOMValidator.java program described in the previous section, I created the following XML file with DTD statements, invalid_dtd.xml:

<?xml version="1.0"?>
<!-- invalid_dtd.xml
 - Copyright (c) 2014, HerongYang.com, All Rights Reserved.
-->
<!DOCTYPE dictionary [
 <!ELEMENT dictionary (note, word+)>
 <!ELEMENT note ANY>
 <!ELEMENT word (update?, name, definition+, usage*)>
 <!ELEMENT update EMPTY>
 <!ATTLIST update 
  date CDATA #REQUIRED 
  editor CDATA #IMPLIED
 >
 <!ELEMENT name (#PCDATA)>
 <!ATTLIST name is_acronym (true | false) "false">
 <!ELEMENT definition (#PCDATA)>
 <!ELEMENT usage (#PCDATA | i)*>
 <!ELEMENT i (#PCDATA)>
 <!ENTITY herong "Dr. Herong Yang">
]>
<dictionary>
 <note>Copyright (c) 2014 by &herong;</note>
 <word>
  <name is_acronym="true" language="EN">POP</name>
  <definition>Post Office Protocol</definition>
  <definition>Point Of Purchase</definition>
 </word>
 <word>
  <update date="2002-12-23"/> 
  <name is_acronym="yes">XML</name>
  <definition>eXtensible Markup Language</definition>
  <note>XML comes from SGML</note>
 </word>
 <word>
  <update editor="Herong Yang"/> 
  <name>markup</name>
  <definition>The amount added to the cost price to calculate 
the selling price - <i>Webster</i></definition>
 </word>
</dictionary>

After running "java DOMValidator invalid_dtd.xml", I got:

Error:
   Public ID: null
   System ID: file:/C:/herong/dictionary_dtd.xml
   Line number: 24
   Column number: 41
   Message: Attribute "language" must be declared for element type 
      "name".

Error:
   Public ID: null
   System ID: file:/C:/herong/dictionary_dtd.xml
   Line number: 30
   Column number: 26
   Message: Attribute "is_acronym" with value "yes" must have a value
      from the list "true false ".

Error:
   Public ID: null
   System ID: file:/C:/herong/dictionary_dtd.xml
   Line number: 33
   Column number: 9
   Message: The content of element type "word" must match 
      "(update?,name,definition+,usage*)".

Error:
   Public ID: null
   System ID: file:/C:/herong/dictionary_dtd.xml
   Line number: 35
   Column number: 33
   Message: Attribute "date" is required and must be specified for 
      element type "update".

Error:
   Public ID: null
   System ID: file:/C:/herong/dictionary_dtd.xml
   Line number: 38
   Column number: 48
   Message: The content of element type "definition" must match 
      "null".

This is perfect. It tells you where the error is, and why it's an error.

Last update: 2014.

Table of Contents

 About This JDK Tutorial Book

 Downloading and Installing JDK 1.8.0 on Windows

 Downloading and Installing JDK 1.7.0 on Windows

 Downloading and Installing JDK 1.6.2 on Windows

 Java Date-Time API

 Date, Time and Calendar Classes

 Date and Time Object and String Conversion

 Number Object and Numeric String Conversion

 Locales, Localization Methods and Resource Bundles

 Calling and Importing Classes Defined in Unnamed Packages

 HashSet, Vector, HashMap and Collection Classes

 Character Set Encoding Classes and Methods

 Character Set Encoding Maps

 Encoding Conversion Programs for Encoded Text Files

 Socket Network Communication

 Datagram Network Communication

 DOM (Document Object Model) - API for XML Files

 SAX (Simple API for XML)

DTD (Document Type Definition) - XML Validation

 DOMValidator.java - XML DTD Validation with DOM

Testing DOM XML DTD Validator

 SAXValidator.java - XML DTD Validation with SAX

 XSD (XML Schema Definition) - XML Validation

 XSL (Extensible Stylesheet Language)

 Message Digest Algorithm Implementations in JDK

 Private key and Public Key Pair Generation

 PKCS#8/X.509 Private/Public Encoding Standards

 Digital Signature Algorithm and Sample Program

 "keytool" Commands and "keystore" Files

 KeyStore and Certificate Classes

 Secret Key Generation and Management

 Cipher - Secret Key Encryption and Decryption

 The SSL (Secure Socket Layer) Protocol

 SSL Socket Communication Testing Programs

 SSL Client Authentication

 HTTPS (Hypertext Transfer Protocol Secure)

 Outdated Tutorials

 References

 PDF Printing Version