code: @SuppressWarnings("unchecked")
      public <V> V v(Object id, Class<V> clazz) {
          Iterator<Vertex> tr = graph.vertices(id);
          return tr.hasNext() ? frame(tr.next(), clazz) : 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
  @param clazz a framing class annotated with {@link peapod.annotations.Vertex}
  @return the framed vertex or {@code null} when not found