public function getMlChildCategoriesAction()
 {
     if (!$this->getRequest()->isAjax()) {
         return;
     }
     $result = array();
     $postData = $this->getRequest()->getPost();
     $catId = $postData['catId'];
     $category = Acaldeira_Mercadolivre_Helper_CategoryData::getMlCategoryInfo($catId);
     $category = $category['body'];
     if ($category->children_categories) {
         foreach ($category->children_categories as $category) {
             $result['categories'][] = array('category_id' => $category->id, 'name' => $category->name);
         }
     }
     //return $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
     $this->getResponse()->clearHeaders()->setHeader('Content-Type', 'text/xml')->setBody(json_encode($result));
 }
 public function getMLSiteCategories()
 {
     return (object) Acaldeira_Mercadolivre_Helper_CategoryData::getSiteCategories();
 }