|  1 | Parent A code to indicate a parent relationship.  | 
|  2 | Child A code to indicate a child relationship.  | 
|  3 | Peer, internal A code to indicate an internal peer relationship.  | 
|  4 | Peer, external A code to indicate an external peer relationship.  | 
|  5 | Finish to start constraint A code to indicate a finish to start constraint relationship.  | 
|  6 | Start to start constraint A code to indicate a start to start constraint relationship.  | 
|  7 | Finish to finish constraint A code to indicate a finish to finish constraint relationship.  | 
|  8 | Start to finish constraint A code to indicate a start to finish constraint relationship.  | 
|  9 | Owner A code to indicate an owner relationship.  | 
|  10 | Contact A code to indicate a contact relationship.  | 
|  11 | Spouse A code to indicate a spouse relationship.  | 
|  12 | Sibling A code to indicate the relationship between brothers and/or sisters.  | 
|  13 | Father A code to indicate a father relationship.  | 
|  14 | Mother A code to indicate a mother relationship.  | 
|  15 | Neighbour A code to indicate a neighbour relationship.  | 
|  16 | Friend A code to indicate a friend relationship.  | 
|  17 | Guardian A code to indicate a guardian relationship.  | 
|  18 | Connecting to The specified object connects to the related object.  |