Port represents a port within a NodeSystem. Each port belongs to a port list:
- The port may be a direct child of the list of input or output ports of a node. Then the port is a /top-level/ port.
- Otherwise the port is a /nested/ port, contained within another port.
Example: In the following node system a, c, e, f are top-level ports and b, d are nested ports. @graph +------------------------—+ | +--------—+ | o a --> o c | | o b o d —> e o --> f o | +--------—+ | +------------------------—+ @endgraph Port allows for read-only access to the port of the NodeSystem. If you want to make modifications, you have to use MutablePort instead.