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11.2. Message Validation

Here is a sample that depicts message validation.
Message Content: 
<MyBook xmlns="example">
  <Chapter1/>
  <Chapter2/>
</MyBook>
This is the associated XML Schema definition: 
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="example"
        xmlns:orders="example">
        <element name="MyBook" type="example:MyBook"/>
        <complexType name="MyBook">
            <sequence>
                <element name="Chapter1" type="string"/>
            </sequence>
        </complexType>
</schema>
The XML content is still well-formed, but it has a Chapter2 element that is not declared as the child of MyBook element in the XML schema. Hence the content cannot be validated against the schema.