CREATE FUNCTION plcoffee_call_handler() RETURNS language_handler
 AS 'MODULE_PATHNAME' LANGUAGE C;
CREATE FUNCTION plcoffee_inline_handler(internal) RETURNS void
 AS 'MODULE_PATHNAME' LANGUAGE C;
CREATE FUNCTION plcoffee_call_validator(oid) RETURNS void
 AS 'MODULE_PATHNAME' LANGUAGE C;
CREATE TRUSTED LANGUAGE plcoffee
 HANDLER plcoffee_call_handler
 INLINE plcoffee_inline_handler
 VALIDATOR plcoffee_call_validator;