XMLReaderValidator.java - Validation Error Messages

XML Tutorials - Herong's Tutorial Examples

Dr. Herong Yang, Version 4.10

XML Tutorials - Herong's Tutorial Examples

∟Validating an XML Document against the Specified XML Schema

∟XMLReaderValidator.java - Validation Error Messages

This section provides a tutorial example on how to review validation error message generated by the sample program, XMLReaderValidator.java, on an XML file that does not meet rules specified in its linked XSD schema file.

Here is an XML file, dictionary_invalid_xsd.xml:

<?xml version="1.0"?>
<dictionary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:noNamespaceSchemaLocation="dictionary.xsd">
<!-- dictionary_invalid_xsd.xml
   Copyright (c) 2012, HerongYang.com, All Rights Reserved.
-->
 <word acronym="yes">
  <name>XML</name>
  <definition reference="Herong's Notes">eXtensible Markup 
Language.</definition>
  <update date="23-Dec-2003"/>
 </word>
 <word symbol="true">
  <name><</name>
  <definition>Mathematical symbol representing the "less than" logical 
operation, like: 1<2.</definition>
  <definition>Reserved symbol in XML representing the beginning of 
tags, like: <![CDATA[<p>Hello world!</p>]]>
  </definition>
  <update editor="Herong Yang"/>
 </word>
 <word symbol="no" acronym="false">
  <name>extensible</name>
  <definition>Capable of being extended.</definition>
 </word>
</dictionary>

Now run the XMLReaderValidator program:

java -cp .;\local\xerces-2_3_0\xercesImpl.jar dictrionary_invalid_xsd.xml

you will get:

Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 7
   Column number: 22
   Message: cvc-datatype-valid.1.2.1: 'yes' is not a valid 'boolean' 
value.
Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 7
   Column number: 22
   Message: cvc-attribute.3: The value 'yes' of attribute 'acronym' on 
element 'word' is not valid with respect to its type.
Error:
   Public ID: null
   System ID: file:///D:/herong/src/dictionary_invalid_xsd.xml
   Line number: 11
   Column number: 31
   Message: cvc-pattern-valid: Value '23-Dec-2003' is not facet-valid 
with respect to pattern '\p{Nd}{4}-\p{Nd}{2}-\p{Nd}{2}'.
Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 11
   Column number: 31
   Message: cvc-attribute.3: The value '23-Dec-2003' of attribute 'date'
on element 'update' is not valid with respect to its type.
Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 20
   Column number: 33
   Message: cvc-complex-type.3.2.2: Attribute 'editor' is not allowed to
appear in element 'update'.
Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 22
   Column number: 36
   Message: cvc-datatype-valid.1.2.1: 'no' is not a valid 'boolean' 
value.
Error:
   Public ID: null
   System ID: file:///D:/herong/dictionary_invalid_xsd.xml
   Line number: 22
   Column number: 36
   Message: cvc-attribute.3: The value 'no' of attribute 'symbol' on 
element 'word' is not valid with respect to its type.

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

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

Syntaxes of DTD Statements

Validating an XML Document against the Specified DTD Document Type

XSD (XML Schema Definition) Introduction