Event germs, guard, transport, and finite code

location transport. No active physical matter is placed inside $K$. Inaccessible spectators may nevertheless carry its abstract labels. For the incoming central edge $c_{-}$, endpoints $j_N,j_S$, and outgoing central edge $c_{+}$, set

Every persistent label retains its name. Fresh outgoing endpoint labels are part of the outgoing description. All central labels realize the same event point; equivalently, transport factors through one junction label $J_0$.

The location map does not encode a developed position. No stress-energy transport, matter channel, measurement, or coupling occurs at the event.