Bug in JDBC driver V. 7.0 ?

When I call the method getTableTypes() in java.sql.DatabaseMetaData, 
all that's returned is:

SYSTEM INDEX.


The code for org.posgresql.DatabaseMetaData suggest that I should get at least
  /**   * Get the table types available in this database.  The results   * are ordered by table type.   *   * <P>The
tabletype is:   *  <OL>   *    <LI><B>TABLE_TYPE</B> String => table type.  Typical types are "TABLE",   *
"VIEW",   "SYSTEM TABLE", "GLOBAL TEMPORARY",   *            "LOCAL TEMPORARY", "ALIAS", "SYNONYM".   *  </OL>   *   *
@returnResultSet each row has a single String column that is a   * table type   */
 

but not the one (only) I get returned

snip:

java.sql.ResultSet rs = dbmd.getTableTypes ();

while (rs.next())  System.out.println(rs.getString(1));

just to rule out a codeing problem

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