79     private $referenceGroup;  variable in refnotes_instruction_mangler
91         $this->referenceGroup = array();
191             if (!empty($this->referenceGroup)) {
192                 $groupNamespace = $this->referenceGroup[0]->getRefnotesAttribute('ns');
199             $this->referenceGroup[] = $call;
201         elseif (!$this->inReference && !empty($this->referenceGroup)) {
215         $count = count($this->referenceGroup);
218             $this->referenceGroup[0]->setRefnotesAttribute('group', 'open');
221                 $this->referenceGroup[$i]->setRefnotesAttribute('group', 'hold');
224             $this->referenceGroup[$count - 1]->setRefnotesAttribute('group', 'close');
227         $this->referenceGroup = array();