function addDocSpecFunction( $functionName, $parameters )
    {
        $docSpec = array_pop( $this->PreStack );
        $this->DocSpecification[] = array ( 'docSpec' => $docSpec,
                                            'isFunction' => true,
                                            'functionName' => $functionName,
                                            'parameters' => $parameters );
        $this->PreStack[] = $docSpec;
    }