Yes, two functions:
openacs=# \df apm__get_value*
\df apm__get_value*
List of functions
-[ RECORD 1 ]-------+-------------------------------------
Schema | public
Name | apm__get_value
Result data type | character varying
Argument data types | character varying, character varying
Type | normal
-[ RECORD 2 ]-------+-------------------------------------
Schema | public
Name | apm__get_value
Result data type | character varying
Argument data types | integer, character varying
Type | normal