When executing an XML rule like the following one:

        <rule id="rule-id-001">
            <when>
                <xmlfile matches="//class-loading/loader-repository" in="jboss-{type}.xml"/>
            </when>
            <perform>
                  <!--whatever-->
            </perform>
            <where param="type">
                <matches pattern="(web|service)" />
            </where>
        </rule>

w/ conditions both on matching an XPath and a file name w/ a parameter, the rule's execution can fail if there are more files that match the file name pattern but not the XPath condition.
For example, suppose we have two file to analyze:

1. jboss-service.xml (it does NOT match the XPath condition)
2. jboss-web.xml (it matches the XPath condition)

If jboss-service.xml is analyzed before jboss-web.xml then the latter won't match even if it should.