[Nml-wg] Path vs Link

Hi, apologize if you already discussed it or it's a silly question. I'm analysing the UML diagram in nml-base pdf doc and comparing Link and Path elements. If I'm not wrong it was said that the set of existing elements should be minimal as much as possible (reusable elements). Following this general rule I'm thinking that Link could be used instead of Path. Now I'm thinking about the case of circuit. Example: there may be 3 domains so we have 3 types of view: high (a path/circuit), medium (a link representing aggregated connection in a domain), low (links inside a domain). Can path be just a link with end nodes representing ends of circuits? regards, Roman