role="catalog_table_entry"><para role="column_definition">
       <structfield>numeric_scale</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Always null, since this information is not applied to return data types in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>datetime_precision</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Always null, since this information is not applied to return data types in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>interval_type</structfield> <type>character_data</type>
      </para>
      <para>
       Always null, since this information is not applied to return data types in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>interval_precision</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Always null, since this information is not applied to return data types in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>type_udt_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that the return data type of the function
       is defined in (always the current database).  Null for a procedure.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>type_udt_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema that the return data type of the function is
       defined in.  Null for a procedure.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>type_udt_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the return data type of the function.  Null for a procedure.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>scope_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Applies to a feature not available in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>scope_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Applies to a feature not available in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>scope_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Applies to a feature not available in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>maximum_cardinality</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Always null, because arrays always have unlimited maximum cardinality in <productname>PostgreSQL</productname>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>dtd_identifier</structfield> <type>sql_identifier</type>
      </para>
      <para>
       An identifier of the data type descriptor of the return data
       type of this function, unique among the data type descriptors
       pertaining to the function.  This is mainly useful for joining