original_string: public function getIdentifier()
      {
          $identifier = $this->getFromNode()->getIdentifier() 
                      . '-'
                      . $this->getType()
                      . '-'
                      . $this->getToNode()->getIdentifier();
          
          return $identifier;
      }
code: public function getIdentifier()
      {
          $identifier = $this->getFromNode()->getIdentifier() 
                      . '-'
                      . $this->getType()
                      . '-'
                      . $this->getToNode()->getIdentifier();
          
          return $identifier;
      }
code_tokens: public function getIdentifier ( ) { $ identifier = $ this -> getFromNode ( ) -> getIdentifier ( ) . '-' . $ this -> getType ( ) . '-' . $ this -> getToNode ( ) -> getIdentifier ( ) ; return $ identifier ; }
docstring: Returns the unique identifier of this node
  
  @return string
docstring_tokens: Returns the unique identifier of this node