Relationship kinds

As part of our acceptance of #375 (location relationships), I took an action to drive a mailing list discussion about values for  location.relationshipKinds , beyond the two values  "includes"  and
"isIncludedBy"  that the issue defines.

So… any ideas? I will take 30 seconds now to ponder…

Some taint-related values? Like
"isSourceOfTaintedDataUsedBy" ,  "isSinkForTaintedDataUsedBy" , and  "sanitizesTaintedDataUsedBy" . (pretty verbose, but I wanted to be clear about the relationships).

Thanks,
Larry