class  | 
InvalidRelationIdException | 
 This exception is raised when relation id provided for a relation is already
 used. 
 | 
class  | 
InvalidRelationServiceException | 
 This exception is raised when an invalid Relation Service is provided. 
 | 
class  | 
InvalidRelationTypeException | 
 Invalid relation type. 
 | 
class  | 
InvalidRoleInfoException | 
 This exception is raised when, in a role info, its minimum degree is greater
 than its maximum degree. 
 | 
class  | 
InvalidRoleValueException | 
 Role value is invalid. 
 | 
class  | 
RelationNotFoundException | 
 This exception is raised when there is no relation for a given relation id
 in a Relation Service. 
 | 
class  | 
RelationServiceNotRegisteredException | 
 This exception is raised when an access is done to the Relation Service and
 that one is not registered. 
 | 
class  | 
RelationTypeNotFoundException | 
 This exception is raised when there is no relation type with given name in
 Relation Service. 
 | 
class  | 
RoleInfoNotFoundException | 
 This exception is raised when there is no role info with given name in a
 given relation type. 
 | 
class  | 
RoleNotFoundException | 
 This exception is raised when a role in a relation does not exist, or is not
 readable, or is not settable. 
 |