anchor.diff:      APIVersion = Ctx#ctx.api_version,
       Prefix = Ctx#ctx.prefix,
       [{MD, V}|Rest] = riak_object:get_contents(RiakObject),
  -    {VHead, Vclock} = vclock_header(RiakObject),
  +    {VHead, Vclock} = riak_kv_wm_utils:vclock_header(RiakObject),
       [VHead,": ",Vclock,"\r\n",
   
        case APIVersion of
  
positive.code: %%      opportunity to extract the 'bucket' and 'key' path
  %%      bindings from the dispatch.
  service_available(RD, Ctx=#ctx{riak=RiakProps}) ->
      case get_riak_client(RiakProps, get_client_id(RD)) of
          {ok, C} ->
              CtxBucket =
                  maybe_decode_uri(RD, wrq:path_info(bucket, RD)),
              CtxKey =
                  maybe_decode_uri(RD, wrq:path_info(key, RD)),
              {true,
               RD,
               Ctx#ctx{
  
negative.code:          expires/2,
           to_multipart_mixed/2,
           process_post/2
          ]).
  
  %% map/reduce link-syntax export
  