@Override
    public <S, E> List<Traversal.Admin<S, E>> getLocalChildren() {
        return this.parameters.getTraversals();
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddVertexStep.java