A Symmetrical Connector is a special type of TravelConnector between rooms that can be traversed in either direction and that, optionally, can largely set itself up so that if the dir property of room1 points to this SymConnector, the reverse dir property of room2 also points to this SymConnector. [SYMCOMM EXTENSION]

SymConnector is a type of TravelConnector (from which it descends by inheritance). A SymConnector can be traversed in both directions, and defining a SymConnector on a direction property of one room automatically attaches it to the reverse direction property of the room to which it leads. Otherwise, a SymConnector behaves much like any other TravelConnector, and can be used to define travel barriers or the side-effects of travel in much the same way.

Internally a SymConnector defines a room1 property and a room2 property, room1 and room2 being the two rooms reciprocally connected by the SymConnector. The room1 and room2 can be set by the extension at preinit if the connector's destination is specified, but it's probably clearer and safer to explictily set the room1 and room2 properties.

class SymConnector :   AutoConnector   DSTravelConnector