"hexBinary" Datatype Values and Representations

This section describes the built-in primitive datatype, 'hexBinary' that represents binary data represented in hexadecimal encoding. Leading and trailing whitespaces allowed and trimmed.

"hexBinary" is a built-in datatype that represents binary data encoded in hexadecimal format with these rules:

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

<?xml version="1.1"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- hexBinary_datatype_test.xsd
 - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved.
-->
<xs:element name="HexBinary_Datatype_Test">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="HexBinary" type="xs:hexBinary"
         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"?>
<!-- hexBinary_datatype_test.xml
 - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved.
-->
<HexBinary_Datatype_Test>

<!-- 3 valid "HexBinary" elements -->
  <HexBinary>    41   </HexBinary>
  <HexBinary>    6865726F6E6779616E672E636F6D   </HexBinary>
  <HexBinary>    6865726f6e6779616e672e636f6d   </HexBinary>

<!-- 3 invalid "HexBinary" elements -->
  <HexBinary>    123   </HexBinary>
  <HexBinary>    4i   </HexBinary>
  <HexBinary>    6865726F6E67 79616E672E636F6D   </HexBinary>
</HexBinary_Datatype_Test>

When validating this XML document with my XsdSchemaValidator.java program presented earlier in the book, I get 3 groups of errors for 3 invalid XML elements:

herong> java XsdSchemaValidator
^^^ hexBinary_datatype_test.xsd hexBinary_datatype_test.xml

Error:
   Line number: 13
   Column number: 36
   Message: cvc-datatype-valid.1.2.1: '123' is not a valid value for
   'hexBinary'. (Must be multiples of 2 characters)

Error:
   Line number: 13
   Column number: 36
   Message: cvc-type.3.1.3: The value '    123   ' of element
   'HexBinary' is not valid.

Error:
   Line number: 14
   Column number: 35
   Message: cvc-datatype-valid.1.2.1: '4i' is not a valid value for
   'hexBinary'. ("i" is not allowed)

Error:
   Line number: 14
   Column number: 35
   Message: cvc-type.3.1.3: The value '    4i   ' of element
   'HexBinary' is not
valid.

Error:
   Line number: 15
   Column number: 62
   Message: cvc-datatype-valid.1.2.1: '6865726F6E67 79616E672E636F6D'
   is not a valid value for 'hexBinary'. (Whitespace is not allowed)

Error:
   Line number: 15
   Column number: 62
   Message: cvc-type.3.1.3: The value
   '    6865726F6E67 79616E672E636F6D   ' of element 'HexBinary' is
   not valid.

Failed with errors: 6

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 APIs

 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

 Archived Tutorials

 References

 Full Version in PDF/EPUB