Minor doc patch: create function

Gavin Sherry

doc/src/sgml/ref/create_function.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.44 2003/01/19 00:13:29 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_function.sgml,v 1.45 2003/03/20 04:41:13 momjian Exp $
 -->
 
 <refentry id="SQL-CREATEFUNCTION">
@@ -66,14 +66,18 @@ CREATE [ OR REPLACE ] FUNCTION <replaceable class="parameter">name</replaceable>
 
      <listitem>
       <para>
-       The data type(s) of the function's arguments, if any.  The
-       input types may be base, complex, or domain types,
-       or the same as the type of an existing column.
+       The data type(s) of the function's arguments (optionally 
+       schema-qualified), if any. The input types may be base, complex, or 
+       domain types, or the same as the type of an existing column.
+      </para>
+      <para>
        The type of a column is referenced by writing <replaceable
        class="parameter">tablename</replaceable>.<replaceable
        class="parameter">columnname</replaceable><literal>%TYPE</literal>;
        using this can sometimes help make a function independent from
        changes to the definition of a table.
+      </para>
+      <para>
        Depending on the implementation language it may also be allowed
        to specify <quote>pseudo-types</> such as <type>cstring</>.
        Pseudo-types indicate that the actual argument type is either
@@ -87,9 +91,13 @@ CREATE [ OR REPLACE ] FUNCTION <replaceable class="parameter">name</replaceable>
 
      <listitem>
       <para>
-       The return data type.  The return type may be specified as a
-       base, complex, or domain type, or the same as the type of an
-       existing column.
+       The return data type (optionally schema-qualified). The return type 
+       may be specified as a base, complex, domain type 
+       or the same as the type of an existing column. See the description
+       under <literal>argtype</literal> above on how to reference the type
+       of an existing column.
+      </para>
+      <para>
        Depending on the implementation language it may also be allowed
        to specify <quote>pseudo-types</> such as <type>cstring</>.
        The <literal>setof</literal>