--
-- xpath/3
--
create or replace function xpath(
  text,
  xml,
  text[]
) returns _xml as $$
xpath$$ language plpgsql;


--
-- xpath/2
--
create or replace function xpath(
  text,
  xml
) returns _xml as $$
select pg_catalog.xpath($1, $2, '{}'::pg_catalog.text[])$$ language plpgsql;