Re: Why don't we have referencing subject/predicate/graph maps?

> Why is this limited to object maps? Wouldn't this be equally useful (or
> useless) on subject maps, predicate maps and graph maps?
>

Richard- I remember when I first reviewed R2RML being struck by the
appearance of arbitrary asymmetry like you are pointing out. It seems to me
it would be good to generalize it. However, I am not sure where we stand on
making changes like this while also trying to get things wrapped up for last
call.

-David