re->db
					->start( aioseo()->core->db->db->posts . ' as p', true )
					->select( 'MAX(`p`.`post_modified_gmt`) as last_modified' )
					->whereRaw( "
					( `p`.`ID` IN
						(
							SELECT `tr`.`object_id`
							FROM `$termRelationshipsTable` as tr
							WHERE `tr`.`term_taxonomy_id` IN ( '$termIds' )
						)
					)" )
					->run()
					->result();
			}

			if ( ! empty( $lastModified[0]->last_modified ) ) {
				$index['lastmod'] = aioseo()->helpers->dateTimeToIso8601( $lastModified[0]->last_modified );
			}
			$indexes[] = $index;
		}

		return $indexes;
	}
}