/** {@inheritDoc} */
 @Override
 public void visit(OnmsResource resource) {
   if (m_resourceAttributeValueMatch.equals(
           resource.getExternalValueAttributes().get(m_resourceAttributeKey))
       || m_resourceAttributeValueMatch.equals(
           resource.getStringPropertyAttributes().get(m_resourceAttributeKey))) {
     m_delegatedVisitor.visit(resource);
   }
 }