the
       (declared or implicit) precision of the type for this domain.
       The precision indicates the number of significant digits.  It
       can be expressed in decimal (base 10) or binary (base 2) terms,
       as specified in the column
       <literal>numeric_precision_radix</literal>.  For all other data
       types, this column is null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>numeric_precision_radix</structfield> <type>cardinal_number</type>
      </para>
      <para>
       If the domain has a numeric type, this column indicates in
       which base the values in the columns
       <literal>numeric_precision</literal> and
       <literal>numeric_scale</literal> are expressed.  The value is
       either 2 or 10.  For all other data types, this column is null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>numeric_scale</structfield> <type>cardinal_number</type>
      </para>
      <para>
       If the domain has an exact numeric type, this column contains
       the (declared or implicit) scale of the type for this domain.
       The scale indicates the number of significant digits to the
       right of the decimal point.  It can be expressed in decimal
       (base 10) or binary (base 2) terms, as specified in the column
       <literal>numeric_precision_radix</literal>.  For all other data
       types, this column is null.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>datetime_precision</structfield> <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
       domain, 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 domain, 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 domains)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>domain_default</structfield> <type>character_data</type>
      </para>
      <para>
       Default expression of the domain
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>udt_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that the domain data type is defined in (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>udt_schema</structfield> <type>sql_identifier</type>