public function increment(NodeRef $nodeRef, NodeRef $extNodeRef, $tag)
    {
        $nodeRefUrl = $nodeRef->getRefURL();
        if(!isset($this->NodeCounts[$nodeRefUrl]))
            $this->NodeCounts[$nodeRefUrl] = 0;

        $this->NodeCounts[$nodeRefUrl]++;

        $this->Logger->debug(__FUNCTION__ ."-> Increment ".$this->getMetaID()." for: $nodeRefUrl");
    }