NAME

       Lire::DerivedSchema - Defines a schema for which the records are derived from another
       schema

SYNOPSIS

         my $schema = Lire::DlfSchema::load_schema( 'www-user_session' );
         my $fields = $schema->fields();

DESCRIPTION

       A Lire::DerivedSchema defines a schema for which the records are computed by an analyser
       using the records of a base schema. An example of a derived schema is the www-user_session
       schema which computes session information from the records in the www schema.

   base()
       Returns the Lire::DlfSchema object from which this schema's records are derived.

   can_join_schema( $schema )
       Returns true if $schema can be joined with this schema. For a DerivedSchema, this will be
       true only when $schema is an ExtendedSchema of this schema or this schema's base. It is
       also possible to join the DerivedSchema with its base.

AUTHOR

       Francis J. Lacoste <flacoste@logreport.org>

VERSION

       $Id: DerivedSchema.pm,v 1.19 2006/07/23 13:16:28 vanbaal Exp $

COPYRIGHT

       Copyright (C) 2001, 2004 Stichting LogReport Foundation LogReport@LogReport.org

       This file is part of Lire.

       Lire is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation; either version 2 of
       the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program
       (see COPYING); if not, check with http://www.gnu.org/copyleft/gpl.html.