Testing XML Schema Location with Namespaces - JAXP

This section describes a tutorial example on how to validate an XML document with schema location assigned inside the XML document using the JAXP interface. Namespace is used in the schema and the XML document.

When a schema is assigned in an XML document with the "schemaLocation" attribute, the assigned schema will be considered as a hint by XML processors.

In fact, you use JAXP (Java API for XML Processing) 1.4 to perform schema validation, it will completely ignore the schema assigned in the "schemaLocation" attribute. Let's use XsdSchemaValidator.java described earlier in this book to test this.

Test 1. If the correct version of the schema is provided, hello_xsd_default_namespace.xml will pass the JAXP validation program:

>type hello_xsd_default_namespace.xml

<?xml version="1.0"?>
<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://herongyang.com"
 xsi:schemaLocation="http://herongyang.com hello_namespace.xsd">
Hello world!</p>


>java XsdSchemaValidator hello_namespace.xsd
 hello_xsd_default_namespace.xml

Passed.

Test 2. If the incorrect version of the schema is provided, hello_xsd_default_namespace.xml will not pass the JAXP validation program. This test proves that XsdSchemaValidator.java totally ignores the schema specified inside the XML document.

>java XsdSchemaValidator hello.xsd hello_xsd_default_namespace.xml

Error:
   Line number: 4
   Column number: 65
   Message: cvc-elt.1: Cannot find the declaration of element 'p'.

Failed with errors: 1

Test 3. JAXP programs do check the namespace specified in the schema and make sure it matches the namespace used in the XML document. See the test below:

>type hello_namespace.xsd

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 targetNamespace="http://herongyang.com">
 <xsd:element name="p" type="xsd:string"/>
</xsd:schema>


>type hello_xsd_namespace_wrong.xml

<?xml version="1.0"?>
<hy:p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:hy="http://herongyang.com/x"
 xsi:schemaLocation="http://herongyang.com/x hello_namespace.xsd">
Hello world!</hy:p>


>java XsdSchemaValidator hello_namespace.xsd
   hello_xsd_namespace_wrong.xml

Error:
   Line number: 4
   Column number: 67
   Message: cvc-elt.1: Cannot find the declaration of element 'hy:p'.

Failed with errors: 1

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

 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

 Assigning XML Schema Location in XML Documents

 Validating XML Documents with Schema Locations

 Validating XML Documents with Schema Locations - JAXP

 Assigning XML Schema Location with Namespaces

 Testing XML Schema Location with Namespaces

Testing XML Schema Location with Namespaces - JAXP

 Overriding Element Types in XML Documents

 Linking Multiple Schema Documents Together

 Glossary

 References

 PDF Printing Version