@Override
    public void initialiseLoops(final String stepLabel , final String loopName){
        this.loopName = loopName;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/O_OB_S_SE_SL_Traverser.java