QueryGraph QEdge Exclude Flag Implementation Notes

[edeutsch]

I was asked to write up an implementation plan for exclude=true implementations. At the moment, only ARAX implements this, but there is guarded interest in making this formally part of TRAPI and ask everyone to recognize this property in some way. Here is what I drafted.

https://docs.google.com/document/d/1Oei8xh4FyzfDUQvtjwEawVvIAmRaSmgVhW3G_S7d6dQ

Would you have a look and see if:

1. This is seems reasonable and if you have comments, please add them directly into the document
2. This is what ARAX has implemented. And if not, should we change the document or should we update ARAX?

thanks!