public function handleKeyword($tag, $value, $staging)
 {
     // Check that it's an authorized keyword for the domain encountered, if not do not create keyword...
     if (!in_array($tag, array_keys($this->known_keywords))) {
         return;
     }
     if ($this->known_keywords[$tag] != '') {
         $this->level_name = $this->known_keywords[$tag];
         if ($value != '') {
             if (!$this->catalogue_parent) {
                 $this->catalogue_parent = new Hstore();
             }
             $this->catalogue_parent[$this->known_keywords[$tag]] = $value;
             $staging['taxon_parents'] = $this->catalogue_parent->export();
         } elseif ($value === "") {
             return;
         }
     }
     $keyword = new ClassificationKeywords();
     $keyword->fromArray(array('keyword_type' => $tag, 'keyword' => $value));
     $this->scientificName .= "{$value} ";
     $staging->addRelated($keyword);
 }