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handling of edge negation #281

@edeutsch

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@edeutsch

There was a crucial discussion today in the Data Modeling call about how to handle negation on edges.
I have a vague recollection that we removed Edge.negation long ago with the idea that they would just be attributes.
But after today's discussion, I am wondering whether it would be better/safer to make negated a first class property of Edge?
Vaccine causes autism?
Vaccine NOT causes autism.
We should follow Data Modeling conclusion closely on this and be very clear how to express this in TRAPI.

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