line 517: Structure of Interactions is different for Transactive Services and VTN/VEN Services

Line 518 states that EI views interoperation as taking place between two of more actors. Are the interactions pair wise, one to many, many to one or many to many? Not clear.

Line 519 states that actors are designated as VTN or VEN. VTN and VEN designations are appropriate in some circumstances such as DR but not in all circumstances such as transactive services.

For example, a Party that owns no resources (generation or loads) such as an Energy Trader or Marketer may buy and sell energy. A VTN is described as invoking operations on a VEN (see line 554 and 555). Energy Traders or Marketers don't invoke operations in the normal course of trading except in the case where two parties have agreed by contract to an option or DR contract.

For transactive services all parties play the same roles as traders or marketers in the above description.