public function action_edit_page()
 {
     $id = $this->request->param('options');
     $content_page = new Content_Page($id);
     if ($content_page->get_page_id()) {
         $this->xml_content_page = $this->xml_content->appendChild($this->dom->createElement('page'));
         // Get all tags associated with pages and images
         $this->xml_content_tags = $this->xml_content->appendChild($this->dom->createElement('tags'));
         $tags = array();
         foreach (Content_Page::get_tags() as $tag) {
             $tags[] = $tag;
         }
         foreach (Content_Image::get_tags() as $tag) {
             foreach ($tags as $tag_to_check) {
                 if ($tag_to_check['name'] == $tag['name']) {
                     break 2;
                 }
             }
             $tags[] = $tag;
         }
         foreach ($tags as $tag) {
             $tag_node = $this->xml_content_tags->appendChild($this->dom->createElement('tag', $tag['name']));
             $tag_node->setAttribute('id', $tag['id']);
         }
         if (count($_POST) && isset($_POST['URI']) && isset($_POST['name'])) {
             if ($_POST['URI'] == '') {
                 $_POST['URI'] = $_POST['name'];
             }
             $_POST['URI'] = URL::title($_POST['URI'], '-', TRUE);
             $post = new Validation($_POST);
             $post->filter('trim');
             $post->rule('Valid::not_empty', 'name');
             if ($post->validate()) {
                 $post_values = $post->as_array();
                 $current_page_data = $content_page->get_page_data();
                 if ($post_values['name'] != $current_page_data['name'] && !Content_Page::page_name_available($post_values['name'])) {
                     $post->add_error('name', 'Content_Page::page_name_available');
                 }
                 if ($post_values['URI'] != $current_page_data['URI'] && !Content_Page::page_URI_available($post_values['URI'])) {
                     $post->add_error('URI', 'Content_Page::page_URI_available');
                 }
             }
             // Retry
             if ($post->validate()) {
                 $tags = array();
                 foreach ($post_values['template_position'] as $nr => $template_position) {
                     if ($post_values['tag_id'][$nr] > 0) {
                         if (!isset($tags[$template_position])) {
                             $tags[$template_position] = array();
                         }
                         $tags[$template_position][] = $post_values['tag_id'][$nr];
                     }
                 }
                 $content_page->update_page_data($post_values['name'], $post_values['URI'], $tags);
                 $this->add_message('Page "' . $post_values['name'] . '" updated');
                 $page_data = $content_page->get_page_data();
                 unset($page_data['tag_ids']);
                 $this->set_formdata($page_data);
             } else {
                 $this->add_error('Fix errors and try again');
                 $this->add_form_errors($post->errors());
                 // Fix template position data
                 $tmp_node = $this->xml_content->appendChild($this->dom->createElement('tmp'));
                 foreach ($post_values['template_position'] as $nr => $template_position) {
                     $template_field_node = $tmp_node->appendChild($this->dom->createElement('template_field'));
                     $template_field_node->setAttribute('id', $template_position);
                     if ($post_values['tag_id'][$nr] > 0) {
                         $tag_node = $template_field_node->appendChild($this->dom->createElement('tag'));
                         $tag_node->setAttribute('id', $post_values['tag_id'][$nr]);
                     }
                 }
                 unset($post_values['template_position'], $post_values['tag_id']);
                 $this->set_formdata($post_values);
             }
         } else {
             $page_data = $content_page->get_page_data();
             unset($page_data['tag_ids']);
             $this->set_formdata($page_data);
         }
         /**
          * Put the page data to the XML
          *
          */
         $page_data = $content_page->get_page_data();
         $page_data['template_fields'] = array();
         foreach ($page_data['tag_ids'] as $template_field_id => $tag_ids) {
             $page_data['template_fields'][$template_field_id . 'template_field'] = array('@id' => $template_field_id);
             foreach ($tag_ids as $tag_id) {
                 $page_data['template_fields'][$template_field_id . 'template_field'][$tag_id . 'tag'] = array('@id' => $tag_id);
             }
         }
         // Unset this, or it will cludge our XML
         unset($page_data['tag_ids']);
         // Set the page data to the page node
         xml::to_XML($page_data, $this->xml_content_page, NULL, 'id');
     } else {
         $this->redirect();
     }
 }