--SQL for XML parser

CREATE OR REPLACE FUNCTION xml_is_well_formed(text) RETURNS bool
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

-- deprecated old name for xml_is_well_formed
CREATE OR REPLACE FUNCTION xml_valid(text) RETURNS bool
	AS '$libdir/pgxml', 'xml_is_well_formed' LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xml_encode_special_chars(text) RETURNS text
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_string(text,text) RETURNS text
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_nodeset(text,text,text,text) RETURNS text
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_number(text,text) RETURNS float4
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_bool(text,text) RETURNS boolean
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;

-- List function

CREATE OR REPLACE FUNCTION xpath_list(text,text,text) RETURNS text
	AS '$libdir/pgxml'
	LANGUAGE C STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_list(text,text) RETURNS text 
AS 'SELECT xpath_list($1,$2,'','')' LANGUAGE SQL STRICT IMMUTABLE;

-- Wrapper functions for nodeset where no tags needed

CREATE OR REPLACE FUNCTION xpath_nodeset(text,text) RETURNS text AS
'SELECT xpath_nodeset($1,$2,'''','''')' LANGUAGE SQL STRICT IMMUTABLE;

CREATE OR REPLACE FUNCTION xpath_nodeset(text,text,text) RETURNS text AS
'SELECT xpath_nodeset($1,$2,'''',$3)' LANGUAGE SQL STRICT IMMUTABLE;

-- Table function

CREATE OR REPLACE FUNCTION xpath_table(text,text,text,text,text) RETURNS setof record
	AS '$libdir/pgxml'
	LANGUAGE C STRICT STABLE;

-- XSLT functions

CREATE OR REPLACE FUNCTION xslt_process(text,text,text) RETURNS text 
	AS '$libdir/pgxml' LANGUAGE C STRICT VOLATILE;

-- the function checks for the correct argument count
CREATE OR REPLACE FUNCTION xslt_process(text,text) RETURNS text 
	AS '$libdir/pgxml' LANGUAGE C STRICT IMMUTABLE;
