type <type>internal</type> and return type <type>internal</type>. The
actual argument will be of the type for the transform, and the function
should be coded as if it were. (But it is not allowed to declare an
- SQL-level function function returning <type>internal</type> without at
+ SQL-level function returning <type>internal</type> without at
least one argument of type <type>internal</type>.) The actual return
value will be something specific to the language implementation.
</para>