[Gzz] PEG: creation_history

[Tuomas Lukka]

==========================================================================
PEG creation_history--tjl: Object creation order RDF schema
==========================================================================

:Authors:  Tuomas Lukka
:Date-Created: 2003-07-28
:Last-Modified: $Date: 2003/07/29 07:21:38 $
:Revision: $Revision: 1.2 $
:Status:   Current
:Stakeholders: benja, mudyc, humppake
:Scope:    Minor
:Type:     Architecture

.. Affect-PEGs:

Time isn't always linear. It can branch. Maybe we should keep track
of the creation of objects as a tree based on versions.

Issues
======

Changes
=======

Create a new namespace, ``http://fenfire.org/rdf-v/2003/07/treetime``.

This namespace shall contain::

    /** An time-like ordering between creation of objects.
     */
    public class TREETIME {
        /** A type that declares a relation to be 
         * a time-like relation.
         * This namespace defines one time-like relation,
         * "follows" for common use, more may be defined
         * to avoid conflicts, using the TimeRelation class.
         */
        static public final Object TimeRelation;

        /** (A, follows, B) means that A was created after B.
         */
        static public final Object follows;

        /** (X, currentOf, follows) means that X is the latest
         * entity in a "follows" chain. This applies to other
         * relations, too.
         */
        static public final Object currentOf;
    }