Hello Sven and all Blender devs,
@Sven: If I understand correctly, you are trying to implement a visual 
programming language? I don't know how much bibliography you have and if you 
need more but I thought I'd speak up a little bit : I work for the Openalea 
project which implements a dataflow visual programming interface that lets us 
build dataflows pretty much like the compositor in blender ( although not as 
good-looking in my opinion, we have a taste for cheesy colors :) ). On the 
business side (ie. not the GUI) the dataflow structure is seperated from the 
dataflow evaluation algorithm. There are a few of them though the main ones are 
the "lambda evaluation" and the "discrete time evaluation".  Here are some 
references:
An early presentation of the project : 
http://openalea.gforge.inria.fr/dokuwiki/lib/exe/fetch.php?media=documentation:publications:openalea_europython07.pdf
 (technical things start slide 8)An introduction that presents the lambda 
evaluation and some other things 
http://www.euroscipy.org/file/3707?vid=download (start slide 6)This one 
(http://www.euroscipy.org/file/3707?vid=download, page 102) contains some more 
details on the algo.
Have a look at their own references, you might find interesting articles for 
your project as Openalea started from what others had done in the visual 
programming domain and expand upon that. 
Greeting,Daniel Barbeau VasquezPS: The website : http://openalea.gforge.inria.fr
                                          
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