anchor.diff:  e.g.
   [source,xml]
   ----
  -<distributable-web xmlns="urn:jboss:distributable-web:1.0">
  +<distributable-web xmlns="urn:jboss:distributable-web:2.0">
       <session-management>
           <immutable-class>foo.bar.ImmutableClass</immutable-class>
           <immutable-class>...</immutable-class>
  
positive.code:             </cookie-config>
          </session-config>
      </shared-session-config>
      <distributable-web xmlns="urn:jboss:distributable-web:1.0">
          <session-management name="foo"/>
      </distributable-web>
  </jboss>
  
negative.code: ----
  <?xml version="1.0" encoding="UTF-8"?>
  <jboss xmlns="urn:jboss:1.0">
      <distributable-web xmlns="urn:jboss:distributable-web:2.0">
          <session-management name="foo"/>
      </distributable-web>
  </jboss>
  