/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla.
 *
 * The Initial Developer of the Original Code is
 * Benjamin Smedberg <bsmedberg@covad.net>.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Axel Hecht <axel@pike.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface rdfITripleVisitor;

/**
 * Interface used in RDF to describe data sources.
 *
 * @status PLASMA
 */

[scriptable, uuid(ebce86bd-1568-4a34-a808-9ccf9cde8087)]
interface rdfIDataSource : nsISupports
{
    /**
     * Visit all the subject resources in the datasource. The order is
     * intederminate and may change from one invocation to the next.
     * The subjects will be in the aSubject argument in calls into
     * aVisitor, aPredicate and aObject will be null.
     * @note Implementations may throw NS_ERROR_NOT_IMPLEMENTED for
     * this method, but in this case RDF serializations of this
     * datasource will not be possible.
     */
    void visitAllSubjects(in rdfITripleVisitor aVisitor);

    /**
     * Visit all the triples in the datasource. The order is
     * intederminate and may change from one invocation to the next.
     * @note Implementations may throw NS_ERROR_NOT_IMPLEMENTED for
     * this method, but in this case RDF serializations of this
     * datasource will not be possible.
     */
    void visitAllTriples(in rdfITripleVisitor aVisitor);
};
