destination URI options in PaySwarm

Dear all,

In the payswarm vocabulary I am unsure whether I should use the term
destination as the key referring to a particular URI. I hope it is not too
out of scope to say I am interested in Ripple and Project Bitmark. If so
for this tech, reply to me elsewhere.

[1] https://wiki.ripple.com/Ripple_URIs
[2] https://github.com/project-bitmark/marking/wiki/Transaction-Data-Model

-Brent Shambaugh