[x3d-public] Behavior of X3D's DOM integration

[Kristian Sons]

Dear X3D community,

although this is a question concerncing the X3DOM integration model, I 
post this quesion to the X3D mailing list, because I know that the 
consortium is really interested in adopting this integration model in a 
future version of X3D.

I am be interested in the intended behavior when synchronization between 
the DOM representation and internal X3D scene graph is necessary. The 
X3DOM paper is not really explicit here.

Let me use the simple DEF/USE example from x3dom.org as example:
http://examples.x3dom.org/example/x3dom_defUse.xhtml

The scene has to <Shape> nodes, one defining the Shape below 
Transform#bar, one that is reusing the Shape below Transform#bar.

Now I remove the defining node (using jQuery syntax):
$("Transform#bar Shape").remove();

Now I have an invalid X3D scene in the DOM with a single <Shape> node 
pointing to a definition that does not exists. The currently included 
X3DOM implementation 1.6.2-dev produces an error, stops rendering 
(displaying both shapes) and gets inactive (I guess this is a bug) . 
Former versions would just render the "USE" node using the previous 
definition.

What the intended behavior? I could think of three behaviors:

1. The USE node has a dangling reference. Consequently nothing is 
rendered at all (corresponds to a reinitialization of the scene state 
based on the new DOM representation)
2. The USE node becomes the DEF node (the DOM corresponds to removing 
the node via SAI and then serializing the scene)
3. The USE node is still rendering the referenced shape but the 
definition does not appear in the DOM (the run-time corresponds to 
removing the node via SAI, but the DOM representation differs)

The first behavior seems the most logical variant for me.

Any opinions on this?

Thanks,
   Kristian










-- 
_______________________________________________________________________________

Kristian Sons
Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI
Agenten und Simulierte Realität
Campus, Geb. D 3 2, Raum 0.77
66123 Saarbrücken, Germany

Phone: +49 681 85775-3833
Phone: +49 681 302-3833
Fax:   +49 681 85775–2235
kristian.sons at dfki.de
http://www.xml3d.org

Geschäftsführung: Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Vorsitzender)
Dr. Walter Olthoff

Vorsitzender des Aufsichtsrats: Prof. Dr. h.c. Hans A. Aukes
Amtsgericht Kaiserslautern, HRB 2313
_______________________________________________________________________________

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