_oid
Get the unique global id of this Thing --
Function
THING -> _oid -> Text
This function produces the unique Object ID (which will generally be a period followed by some letters and numbers)
of the received Thing.
Each Thing in Querki has an Object ID. In most cases, it can be used in place of the Thing's name, and it is never
ambiguous -- it always refers to one specific Thing.
Advanced: This can be used to print out OIDs that do not correspond to Things in this Space. This is
rarely useful, but is useful for a few very advanced situations.