role="catalog_table_entry"><para role="column_definition">
       <structfield>table_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the table that is used by some constraint
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that contains the constraint (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema that contains the constraint
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>constraint_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the constraint
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="infoschema-data-type-privileges">
  <title><literal>data_type_privileges</literal></title>

  <para>
   The view <literal>data_type_privileges</literal> identifies all
   data type descriptors that the current user has access to, by way
   of being the owner of the described object or having some privilege
   for it.  A data type descriptor is generated whenever a data type
   is used in the definition of a table column, a domain, or a
   function (as parameter or return type) and stores some information
   about how the data type is used in that instance (for example, the
   declared maximum length, if applicable).  Each data type
   descriptor is assigned an arbitrary identifier that is unique
   among the data type descriptor identifiers assigned for one object
   (table, domain, function).  This view is probably not useful for
   applications, but it is used to define some other views in the
   information schema.
  </para>

  <table>
   <title><structname>data_type_privileges</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>object_catalog</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the database that contains the described object (always the current database)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>object_schema</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the schema that contains the described object
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>object_name</structfield> <type>sql_identifier</type>
      </para>
      <para>
       Name of the described object
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>object_type</structfield> <type>character_data</type>
      </para>
      <para>
       The type of the described object: one of
       <literal>TABLE</literal> (the data type descriptor pertains to
       a column of that table), <literal>DOMAIN</literal> (the data
       type descriptors pertains to that domain),
       <literal>ROUTINE</literal> (the data type descriptor pertains
       to a parameter or the return data type of that function).
      </para></entry>
     </row>

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