linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       References a handler function that is responsible for
       supplying execution routines for the foreign-data wrapper.
       Zero if no handler is provided
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>fdwvalidator</structfield> <type>oid</type>
       (references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       References a validator function that is responsible for
       checking the validity of the options given to the
       foreign-data wrapper, as well as options for foreign servers and user
       mappings using the foreign-data wrapper.  Zero if no validator
       is provided
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>fdwacl</structfield> <type>aclitem[]</type>
      </para>
      <para>
       Access privileges; see <xref linkend="ddl-priv"/> for details
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>fdwoptions</structfield> <type>text[]</type>
      </para>
      <para>
       Foreign-data wrapper specific options, as <quote>keyword=value</quote> strings
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>


 <sect1 id="catalog-pg-foreign-server">
  <title><structname>pg_foreign_server</structname></title>

  <indexterm zone="catalog-pg-foreign-server">
   <primary>pg_foreign_server</primary>
  </indexterm>

  <para>
   The catalog <structname>pg_foreign_server</structname> stores
   foreign server definitions.  A foreign server describes a source
   of external data, such as a remote server.  Foreign
   servers are accessed via foreign-data wrappers.
  </para>

  <table>
   <title><structname>pg_foreign_server</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>oid</structfield> <type>oid</type>
      </para>
      <para>
       Row identifier
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>srvname</structfield> <type>name</type>
      </para>
      <para>
       Name of the foreign server
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>srvowner</structfield> <type>oid</type>
       (references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       Owner of the foreign server
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>srvfdw</structfield> <type>oid</type>
       (references <link linkend="catalog-pg-foreign-data-wrapper"><structname>pg_foreign_data_wrapper</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       OID of the foreign-data wrapper of this foreign server
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>srvtype</structfield> <type>text</type>
      </para>
      <para>
       Type of the server (optional)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>srvversion</structfield> <type>text</type>
      </para>