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<p>This example assumes the following class is already on your CLASSPATH:</p>

<p>A number of <a href="http://relaxng.org/">RELAX NG</a> validators are available (e.g. <a href="https://msv.dev.java.net/">MSV</a> and <a href="http://www.thaiopensource.com/relaxng/jing.html">Jing</a>). Rather than using the APIs for these validators directly, you might want to consider using the <a href="http://iso-relax.sourceforge.net/">ISO RELAX</a> project's common JARV API for accessing validators. Using this common API, you can switch between the <a href="http://iso-relax.sourceforge.net/JARV/JARV.html#download">available validators</a> without changing your source code.</p>

<p>An even better option (if you are using Java 5 or above, or otherwise have JAXP 1.3 available to you) is to use the <a href="https://isorelax-jaxp-bridge.dev.java.net/">ISORELAX JARV to JAXP 1.3 Xml Validation Engine Adaptor</a>. This hooks into the built-in JAXP validation Factory support in JAXP and makes the code that you use to access the RELAX NG validator the same as you would do for a W3C XML Schema validator.</p>

<p>Here is what the code would look like:</p>

<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
// require(url:'http://iso-relax.sourceforge.net/', jar:'isorelax.jar')
// require(groupId:'org.iso_relax.verifier.jaxp.validation', artifactId:'isorelax-jaxp-bridge', version:'1.0')
// require(url:'https://msv.dev.java.net/', jar:'msv.jar')

def rng = '''
&lt;grammar xmlns="http://relaxng.org/ns/structure/1.0"
         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
    &lt;start>
        &lt;ref name="records"/>
    &lt;/start>
    &lt;define name="car">
        &lt;element name="car">
            &lt;attribute name="make">
                &lt;data type="token"/>
            &lt;/attribute>
            &lt;attribute name="name">
                &lt;text/>
            &lt;/attribute>
            &lt;attribute name="year">
                &lt;data type="integer"/>
            &lt;/attribute>
            &lt;ref name="country"/>
            &lt;ref name="record"/>
        &lt;/element>
    &lt;/define>
    &lt;define name="country">
        &lt;element name="country">
            &lt;text/>
        &lt;/element>
    &lt;/define>
    &lt;define name="record">
        &lt;element name="record">
            &lt;attribute name="type">
                &lt;data type="token"/>
            &lt;/attribute>
            &lt;text/>
        &lt;/element>
    &lt;/define>
    &lt;define name="records">
        &lt;element name="records">
            &lt;oneOrMore>
                &lt;ref name="car"/>
            &lt;/oneOrMore>
        &lt;/element>
    &lt;/define>
&lt;/grammar>
'''.trim()

import javax.xml.XMLConstants
import javax.xml.transform.stream.StreamSource
import javax.xml.validation.SchemaFactory

def factory = SchemaFactory.newInstance(XMLConstants.RELAXNG_NS_URI)
def schema = factory.newSchema(new StreamSource(new StringReader(rng)))
def validator = schema.newValidator()
validator.validate(new StreamSource(new StringReader(XmlExamples.CAR_RECORDS)))
</pre></td></tr></table>