protected function unmarshall(DOMElement $element)
    {
        if (($responseIdentifier = $this->getDOMElementAttributeAs($element, 'responseIdentifier')) !== null) {

            if (($autostart = $this->getDOMElementAttributeAs($element, 'autostart', 'boolean')) !== null) {

                $objectElts = $this->getChildElementsByTagName($element, 'object');
                if (count($objectElts) > 0) {
                    $objectElt = $objectElts[0];
                    $object = $this->getMarshallerFactory()->createMarshaller($objectElt)->unmarshall($objectElt);

                    $component = new MediaInteraction($responseIdentifier, $autostart, $object);

                    $promptElts = $this->getChildElementsByTagName($element, 'prompt');
                    if (count($promptElts) > 0) {
                        $promptElt = $promptElts[0];
                        $prompt = $this->getMarshallerFactory()->createMarshaller($promptElt)->unmarshall($promptElt);
                        $component->setPrompt($prompt);
                    }

                    if (($minPlays = $this->getDOMElementAttributeAs($element, 'minPlays', 'integer')) !== null) {
                        $component->setMinPlays($minPlays);
                    }

                    if (($maxPlays = $this->getDOMElementAttributeAs($element, 'maxPlays', 'integer')) !== null) {
                        $component->setMaxPlays($maxPlays);
                    }

                    if (($loop = $this->getDOMElementAttributeAs($element, 'loop', 'boolean')) !== null) {
                        $component->setLoop($loop);
                    }

                    if (($xmlBase = self::getXmlBase($element)) !== false) {
                        $component->setXmlBase($xmlBase);
                    }

                    $this->fillBodyElement($component, $element);

                    return $component;
                } else {
                    $msg = "A 'mediaInteraction' element must contain exactly one 'object' element, none given.";
                    throw new UnmarshallingException($msg, $element);
                }
            } else {
                $msg = "The mandatory 'autostart' attribute is missing from the 'mediaInteraction' element.";
                throw new UnmarshallingException($msg, $element);
            }
        } else {
            $msg = "The mandatory 'responseIdentifier' attribute is missing from the 'mediaInteraction' element.";
            throw new UnmarshallingException($msg, $element);
        }
    }