private function searchForResultsThatCompareEqualToClassOf($categoryName)
 {
     $propertyValue = new PropertyValue('__pro');
     $propertyValue->setDataItem(new DIProperty('_INST'));
     $description = new ClassDescription(new DIWikiPage($categoryName, NS_CATEGORY, ''));
     $description->addPrintRequest(new PrintRequest(PrintRequest::PRINT_PROP, null, $propertyValue));
     $query = new Query($description, false, false);
     $query->querymode = Query::MODE_INSTANCES;
     return $this->getStore()->getQueryResult($query);
 }