question: protected void addMembers ( List < RelationMember > newMembers , boolean atBeginning ) { if ( atBeginning ) { members . addAll ( 0 , newMembers ) ; } else { members . addAll ( newMembers ) ; } }
target:  Adds multiple elements to the relation in the order in which they appear in the list. They can be either prepended or appended to the existing nodes.