/**
     * Adds a custom element to your HTML definition
     * @see HTMLPurifier_HTMLModule::addElement() for detailed
     *       parameter and return value descriptions.
     */
    public function addElement($element_name, $type, $contents, $attr_collections, $attributes = array())
    {
        $module = $this->getAnonymousModule();
        // assume that if the user is calling this, the element
        // is safe. This may not be a good idea
        $element = $module->addElement($element_name, $type, $contents, $attr_collections, $attributes);
        return $element;
    }
 

    public function addElement($element, $type, $contents, $attr_includes = array(), $attr = array())
    {
        $this->elements[] = $element;
        // parse content_model
        list($content_model_type, $content_model) = $this->parseContents($contents);
        // merge in attribute inclusions
        $this->mergeInAttrIncludes($attr, $attr_includes);
        // add element to content sets
        if ($type) {
            $this->addElementToContentSet($element, $type);
        }
        // create element
        $this->info[$element] = HTMLPurifier_ElementDef::create(
            $content_model,
            $content_model_type,
            $attr
        );
        // literal object $contents means direct child manipulation
        if (!is_string($contents)) {
            $this->info[$element]->child = $contents;
        }
        return $this->info[$element];
    }