<type>cardinal_number</type>
      </para>
      <para>
       If <literal>data_type</literal> identifies a date, time,
       timestamp, or interval type, this column contains the (declared
       or implicit) fractional seconds precision of the type for this
       column, that is, the number of decimal digits maintained
       following the decimal point in the seconds value.  For all
       other data types, this column is null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>interval_type</structfield> <type>character_data</type>
      </para>
      <para>
       If <literal>data_type</literal> identifies an interval type,
       this column contains the specification which fields the
       intervals include for this column, e.g., <literal>YEAR TO
       MONTH</literal>, <literal>DAY TO SECOND</literal>, etc.  If no
       field restrictions were specified (that is, the interval
       accepts all fields), and for all other data types, this field
       is null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>interval_precision</structfield> <type>cardinal_number</type>
      </para>
      <para>
       Applies to a feature not available
       in <productname>PostgreSQL</productname>
       (see <literal>datetime_precision</literal> for the fractional
       seconds precision of interval type columns)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>character_set_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>character_set_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>character_set_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>collation_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database containing the collation of the column
       (always the current database), null if default or the data type
       of the column is not collatable
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>collation_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema containing the collation of the column, null
       if default or the data type of the column is not collatable
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>collation_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the collation of the column, null if default or the
       data type of the column is not collatable
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>domain_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       If the column has a domain type, the name of the database that
       the domain is defined in (always the current database), else
       null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para