function to_tripod_view_array($docId,$context)
    {
        $subjects = $this->get_subjects();
        $contextAlias = $this->_labeller->uri_to_alias($context);

        // view
        $doc = array();
        $doc["_id"] = array(_ID_RESOURCE=>$docId,_ID_CONTEXT=>$contextAlias);
        $doc["value"] = array();
        $doc["value"][_IMPACT_INDEX] = $subjects;
        $doc["value"][_GRAPHS] = array();
        foreach ($subjects as $subject)
        {
            $graph = $this->get_subject_subgraph($subject);
            $doc["value"][_GRAPHS][] = $this->index_to_tarray($graph,$contextAlias);
        }
        return $doc;
    }