Dear all, 

Can somebody comment  on the role & purpose  of "mergenode" in Resource 
Graphs.

In the documentation  ( 
http://arches3.readthedocs.org/en/latest/arches-data/#resource-graphs ) it 
just says:

mergenode: defines the upstream node that occurs one time (and only one 
> time) within a given resource instance. In most cases, that node is the one 
> that represents the resource itself.


When inspecting an existing graph. e.g. ACTOR.E39 I can see that the 
mergenode depicts the root of "useful" sub-graphs, i.e. for PLACE, 
APPELATION and ARCHES_EVENT_PHASE. 

But what are actually the consequences of adding mergenodes - or leaving 
them out? Is it used and/or required for specifiying "required" and 
"unique" (""one time (and only one time)" ) ? (But this would mean, that 
only a SINGLE ARCHES_EVENT_PHASE can be assigned to a ACTOR, which seems 
odd ?)
Why do some sub-graphs have a mergenode, while others just "merge" with the 
root-node of the whole Resource Graph ?  (e.g. 
BEGINNING_OF_EXISTENCE_TYPE.E63)

yours puzzled :-)

Hannes

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