public String nextXId() {
        return this.x++ + DOT + this.y + DOT + this.z + LEFT_PARENTHESES + this.parentId + RIGHT_PARENTHESES;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/util/StepPosition.java