Draw signalling connections #4

When drawing connections, do the units of the source's intrinsic variable match those of any variable of the candidate target?

• If so, the source is a candidate to assign a value to the target's variable.
• Indicate this by setting the connection's style to dashed.
• Connections to Reactions (incl. Osmosis):
  • Domain quantity symbol + portId ==> can get value from the storage node when the port is connected to a ZSN.
  • If connected to a 0:node then need a signal connection to some storage element.