Creates a link between the pair of instance objects in the associations
link set.
Parameters: system - Value of the first association end. Parameters: usageSpecification - Value of the second association end.
Queries whether a link currently exists between a given pair of instance
objects in the associations link set.
Parameters: system - Value of the first association end. Parameters: usageSpecification - Value of the second association end. Returns true if the queried link exists.
Queries the instance object that is related to a particular instance object
by a link in the current associations link set.
Parameters: usageSpecification - Required value of the second association end. Related object or null if none exists.
Queries the instance object that is related to a particular instance object
by a link in the current associations link set.
Parameters: system - Required value of the first association end. Related object or null if none exists.
Removes a link between a pair of instance objects in the current associations
link set.
Parameters: system - Value of the first association end. Parameters: usageSpecification - Value of the second association end.