Testing DOM XML DTD Validator

JDK Tutorials - Herong's Tutorial Examples

∟DTD (Document Type Definition) - XML Validation

∟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) 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 "Herong Yang">
]>
<dictionary>
 <note>Copyright (c) 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.java 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".