code: @SuppressWarnings("unchecked")
      public <V> V v(Object id) {
          Iterator<Vertex> it = graph.vertices(id);
          return it.hasNext() ? frame(it.next()) : null;
      }
docs: Get a {@link Vertex} given its unique identifier.
  
  @param <V> Framing class annotated with  {@link peapod.annotations.Vertex}
  @param id  The unique identifier of the linked vertex to locate
  @return the framed vertex or {@code null} when not found