Multible Dissectors creating the same Dissector Table

[Andreas Wilkes <wilkesan () uni-hildesheim de>]

Hello,

I am currently working on a protocol stack which is not fully standardized and still under development.
The Protocol stack is: Ethernet > ProtocolA > ProtocolB,C or D
My Problem is There are multiple Versions of Protocol A and multiple Dissectors for Protocol A.
I since my focus is on the following protocols I want to write a Dissector for A which works on all Protocol Versions 
and therefore registers all Dissector Tables which get registered by the existing Dissectors for A.
The Problem is, you can't register a dissector Table that is already registered. Therefore my dissector will crash 
wireshark if any other dissector for A is present.

Is there a way to avoid double registration but still register the missing dissector tables of the Protocol Versions 
where no dissector is present?

Maybe there is a possibility that some code of my dissector can be executed between the register and the 
register_handout method where i can check which dissector tables has been created and which has not.

with kind regards

Andreas Wilkes
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