| Enumerator | 
|---|
| GV_PORTDESCRIPTION_NONE  | No flag.  
 | 
| GV_PORTDESCRIPTION_MULTIPLE  | Allow multiple instances per node.  
 | 
| GV_PORTDESCRIPTION_INVISIBLE  | Invisible port.  
 | 
| GV_PORTDESCRIPTION_STATIC  | Static port.  
 | 
| GV_PORTDESCRIPTION_FIXED  | Not movable.  
 | 
| GV_PORTDESCRIPTION_PORTONLY  | Only as port.  
 | 
| GV_PORTDESCRIPTION_NEEDED  | Needs a connection.  
 | 
| GV_PORTDESCRIPTION_ITERATOR  | Iterator output.  
 |