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            $class = false;
        }

        $method = $function->getName();

        $dom    = new DOMDocument('1.0', 'UTF-8');
        if ($class) {
            $root   = $dom->createElement($class);
            $method = $dom->createElement($method);
            $root->appendChild($method);
        } else {
            $root   = $dom->createElement($method);
            $method = $root;
        }
        $root->setAttribute('generator', 'zend');
        $root->setAttribute('version', '1.0');
        $dom->appendChild($root);

        $this->_structValue($struct, $dom, $method);

        $struct = (array) $struct;
        if (!isset($struct['status'])) {
            $status = $dom->createElement('status', 'success');
            $method->appendChild($status);
        }

        return $dom->saveXML();
    }

    /**
     * Recursively iterate through a struct
     *
     * Recursively iterates through an associative array or object's properties
     * to build XML response.
     *
     * @param mixed $struct
     * @param DOMDocument $dom
     * @param DOMElement $parent
     * @return void
     */
    protected function _structValue($struct, DOMDocument $dom, DOMElement $parent)
    {
        $struct = (array) $struct;

        foreach ($struct as $key => $value) {
            if ($value === false) {
                $value = 0;
            } elseif ($value === true) {
                $value = 1;
            }

            if (ctype_digit((string) $key)) {
                $key = 'key_' . $key;
            }

            if (is_array($value) || is_object($value)) {
                $element = $dom->createElement($key);
                $this->_structValue($value, $dom, $element);
            } else {
                $element = $dom->createElement($key);
                $element->appendChild($dom->createTextNode($value));
            }

            $parent->appendChild($element);
        }
    }

    /**
     * Handle a single value
     *
     * @param string|int|boolean $value Result value
     * @return string XML Response
     */
    protected function _handleScalar($value)
    {
        $function = $this->_functions[$this->_method];
        if ($function instanceof Zend_Server_Reflection_Method) {
            $class = $function->getDeclaringClass()->getName();
        } else {
            $class = false;
        }

        $method = $function->getName();

        $dom = new DOMDocument('1.0', 'UTF-8');
        if ($class) {
            $xml = $dom->createElement($class);
            $methodNode = $dom->createElement($method);
            $xml->appendChild($methodNode);
        } else {
            $xml = $dom->createElement($method);
            $methodNode = $xml;
        }
        $xml->setAttribute('generator', 'zend');
        $xml->setAttribute('version', '1.0');
        $dom->appendChild($xml);

        if ($value === false) {
            $value = 0;
        } elseif ($value === true) {
            $value = 1;
        }

        if (isset($value)) {
            $element = $dom->createElement('response');
            $element->appendChild($dom->createTextNode($value));
            $methodNode->appendChild($element);
        } else {
            $methodNode->appendChild($dom->createElement('response'));
        }

        $methodNode->appendChild($dom->createElement('status', 'success'));

        return $dom->saveXML();
    }

    /**
     * Implement Zend_Server_Interface::fault()
     *
     * Creates XML error response, returning DOMDocument with response.
     *
     * @param string|Exception $fault Message
     * @param int $code Error Code
     * @return DOMDocument
     */
    public function fault($exception = null, $code = null)
    {
        if (isset($this->_functions[$this->_method])) {
            $function = $this->_functions[$this->_method];
        } elseif (isset($this->_method)) {
            $function = $this->_method;
        } else {
            $function = 'rest';
        }

        if ($function instanceof Zend_Server_Reflection_Method) {
            $class = $function->getDeclaringClass()->getName();
        } else {
            $class = false;
        }

        if ($function instanceof Zend_Server_Reflection_Function_Abstract) {
            $method = $function->getName();
        } else {
            $method = $function;
        }

        $dom = new DOMDocument('1.0', 'UTF-8');
        if ($class) {
            $xml       = $dom->createElement($class);
            $xmlMethod = $dom->createElement($method);
            $xml->appendChild($xmlMethod);
        } else {
            $xml       = $dom->createElement($method);
            $xmlMethod = $xml;
        }
        $xml->setAttribute('generator', 'zend');
        $xml->setAttribute('version', '1.0');
        $dom->appendChild($xml);

        $xmlResponse = $dom->createElement('response');
        $xmlMethod->appendChild($xmlResponse);

        if ($exception instanceof Exception) {
            $element = $dom->createElement('message');
            $element->appendChild($dom->createTextNode($exception->getMessage()));
            $xmlResponse->appendChild($element);
            $code = $exception->getCode();
        } elseif (!is_null($exception) || 'rest' == $function) {
            $xmlResponse->appendChild($dom->createElement('message', 'An unknown error occured. Please try again.'));
        } else {
            $xmlResponse->appendChild($dom->createElement('message', 'Call to ' . $method . ' failed.'));
        }

        $xmlMethod->appendChild($xmlResponse);
        $xmlMethod->appendChild($dom->createElement('status', 'failed'));

        // Headers to send
        if (is_null($code) || (404 != $code))
        {
            $this->_headers[] = 'HTTP/1.0 400 Bad Request';
        } else {
            $this->_headers[] = 'HTTP/1.0 404 File Not Found';
        }

        return $dom;
    }

    /**
     * Retrieve any HTTP extra headers set by the server
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->_headers;
    }

    /**
     * Implement Zend_Server_Interface::addFunction()
     *
     * @param string $function Function Name
     * @param string $namespace Function namespace (unused)
     */
    public function addFunction($function, $namespace = '')
    {
        if (!is_array($function)) {
            $function = (array) $function;
        }

        foreach ($function as $func) {
            if (is_callable($func) && !in_array($func, self::$magic_methods)) {
                $this->_functions[$func] = $this->_reflection->reflectFunction($func);
            } else {
                throw new Zend_Rest_Server_Exception("Invalid Method Added to Service.");
            }
        }
    }

    /**
     * Implement Zend_Server_Interface::getFunctions()
     *
     * @return array An array of Zend_Server_Reflection_Method's
     */
    public function getFunctions()
    {
        return $this->_functions;
    }

    /**
     * Implement Zend_Server_Interface::loadFunctions()
     *
     * @todo Implement
     * @param array $functions
     */
    public function loadFunctions($functions)
    {
    }

    /**
     * Implement Zend_Server_Interface::setPersistence()
     *
     * @todo Implement
     * @param int $mode
     */
    public function setPersistence($mode)
    {
    }
}