XSD Tutorials - Herong's Tutorial Examples - Version 5.10, by Dr. Herong Yang

"boolean" Datatype Values and Representations

This section describes the built-in primitive datatype, 'boolean' that represents 2 Boolean values of true and false. Whitespaces are allowed and removed.

"boolean" is probably the most simplest built-in datatype supported in XSD 1.1. Here is how it is defined:

  • The value space of "boolean" contains 2 values: true and false.
  • The lexical space of "boolean" contains 4 representtions: 'true', 'false', '1' and '0'.
  • Leading and trailing whitespaces allowed and trimmed.

To verify these rules, I wrote this simple XSD document that uses "boolean" datatype to declare XML elements:

<?xml version="1.1"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- boolean_datatype_test.xsd
 - Copyright (c) 2013, HerongYang.com, All Rights Reserved.
-->
<xs:element name="Boolean_Datatype_Test">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="Boolean" type="xs:boolean" 
         maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
</xs:schema>

Here is a sample XML document that can be used to test these declarations:

<?xml version="1.1"?>
<!-- boolean_datatype_test.xml
 - Copyright (c) 2013, HerongYang.com, All Rights Reserved.
-->
<Boolean_Datatype_Test>

<!-- 4 valid "Boolean" elements -->
  <Boolean>    true   </Boolean>
  <Boolean>    1   </Boolean>
  <Boolean>    false   </Boolean>
  <Boolean>    0   </Boolean>

<!-- 3 invalid "Boolean" elements -->
  <Boolean>    True   </Boolean>
  <Boolean>    FALSE   </Boolean>
  <Boolean>    1=1  </Boolean>
</Boolean_Datatype_Test>

When validating this XML document with my XsdSchemaValidator.java program presented earlier in the book, I get 6 groups of errors for 6 invalid XML elements:

c:\Progra~1\Java\jdk1.7.0_07\bin\java XsdSchemaValidator 
   boolean_datatype_test.xsd boolean_datatype_test.xml
   
Error:
   Line number: 14
   Column number: 33
   Message: cvc-datatype-valid.1.2.1: 'True' is not a valid value for
   'boolean'. (Must all lower cases)


Error:
   Line number: 14
   Column number: 33
   Message: cvc-type.3.1.3: The value '    True   ' of element 
   'Boolean' is not valid.

Error:
   Line number: 15
   Column number: 34
   Message: cvc-datatype-valid.1.2.1: 'FALSE' is not a valid value for
   'boolean'. (Must all lower cases)

Error:
   Line number: 15
   Column number: 34
   Message: cvc-type.3.1.3: The value '    FALSE   ' of element 
   'Boolean' is not valid.

Error:
   Line number: 16
   Column number: 31
   Message: cvc-datatype-valid.1.2.1: '1=1' is not a valid value for
   'boolean'. (Not a valid representation)

Error:
   Line number: 16
   Column number: 31
   Message: cvc-type.3.1.3: The value '    1=1  ' of element 'Boolean'
   is not valid.

Failed with errors: 6   

Last update: 2013.

Table of Contents

 About This Book

 Introduction to XML Schema

 XML Editor and Schema Processor - XMLPad

 Java API for XML Processing - JAXP

 JAXP - XML Schema (XSD) Validation

 Xerces2 Java Parser - Java API of XML Parsers

 Using Xerces2 Java API

 XML Schema Language - Basics

 Introduction of XSD Built-in Datatypes

 "string" and Its Derived Datatypes

 "decimal" and Its Derived Datatypes

 "dateTime" and Its Related Datatypes

Miscellaneous Built-in Datatypes

 "anyURI" Datatype Values and Representations

 "QName" Datatype Values and Representations

 "NOTATION" Datatype Values and Representations

 "base64Binary" Datatype Values and Representations

 "hexBinary" Datatype Values and Representations

 "float" and "double" Datatype Values and Representations

"boolean" Datatype Values and Representations

 Facets, Constraining Facets and Restriction Datatypes

 "simpleType" - Defining Your Own Simple Datatypes

 Complex Element Declaration

 Identity-Constraints: unique, key and keyref

 Assertion as Custom Validation Rules

 XML Schema Location and Namespace in XML Documents

 Overriding Element Types in XML Documents

 Linking Multiple Schema Documents Together

 Glossary

 References

 PDF Printing Version

"boolean" Datatype Values and Representations - Updated in 2014, by Dr. Herong Yang