Объясните закономерность по запросу 2 доп свойств

         $property5 = array();
            $property5['xml_show_group_property'] = true;

            $element['type'] = 1;
            $element['prefix'] = 'and';
            $element['property_id'] = 30;
            $element['if'] = '!=';
            $element['value'] = '';
            $element['sufix'] = '';
            $property5['select'][] = $element;

            $element['type'] = 1;
            $element['prefix'] = 'and';
            $element['property_id'] = 33;
            $element['if'] = '=';
            $element['value'] = '1';
            $element['sufix'] = '';
            $property5['select'][] = $element;

         $InformationSystem->ShowInformationSystem ($InformationSystem_id, false, $xsl_list, $InformationResult['items_on_page'], $InformationResult['items_begin'], $external_propertys, $property5);
            $property3 = array();

            $element['type'] = 1;
            $element['prefix'] = 'and (';
            $element['property_id'] = 31;
            $element['if'] = '!=';
            $element['value'] = '';
            $element['sufix'] = '';
            $property3['select'][] = $element;

            $element['type'] = 1;
            $element['prefix'] = 'and';
            $element['property_id'] = 34;
            $element['if'] = '>';
            $element['value'] = '0';
            $element['sufix'] = ')';
            $property3['select'][] = $element;
         $InformationSystem->ShowInformationSystem ($InformationSystem_id, false, $xsl_list_audio, $InformationResult['items_on_page'], $InformationResult['items_begin'], $external_propertys, $property3);