struts2-oval-plugin/src/test/resources/org/apache/struts2/oval/interceptor/SimpleFieldsXML-validation.xml

<?xml version="1.0" encoding="UTF-8"?>
<oval xmlns="http://oval.sf.net/oval-configuration" xmlns:xsi="http://http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://oval.sf.net/oval-configuration http://oval.sourceforge.net/oval-configuration-1.3.xsd">
    <class type="org.apache.struts2.oval.interceptor.SimpleFieldsXML" overwrite="false"
           applyFieldConstraintsToSetters="true">
        <field name="firstName">
            <notNull/>
        </field>
    </class>
</oval>