anchor.diff:  			end;
   		{_, {_, "PublicWLANAccessUsage"}, []} ->
   			{error, 404}; % todo?
  -		{_, {_, "HTTPUsageTransfer"}, []} ->
  +		{_, {_, "HTTPTransferUsage"}, []} ->
   			DateTime = proplists:get_value("datetime", Query, '_'),
   			Host = proplists:get_value("host", Query, '_'),
   			User = proplists:get_value("user", Query, '_'),
  
positive.code: 			query_page1(PageServer, Etag, fun usage_aaa_acct/2, Filters, Start, End);
  		{_, {_, "PublicWLANAccessUsage"}, []} ->
  			{error, 404}; % todo?
  		{_, {_, "HTTPUsageTransfer"}, []} ->
  			query_page1(PageServer, Etag, fun usage_http_transfer/2, Filters, Start, End);
  		{_, {_, _}, []} ->
  			{error, 404};
  
negative.code: 
  %% @hidden
  usage_http_transfer({Host, User, DateTime, Method, URI, HttpStatus}, Filters) ->
  	UsageSpec = {struct, [{"id", "HTTPTransferUsageSpec"},
  			{"href", "/usageManagement/v1/usageSpecification/HTTPTransferUsageSpec"},
  			{"name", "HTTPTransferUsageSpec"}]},
  	Type = "HTTPTransferUsage",
  	UsageChars = [{struct, [{"name", "host"}, {"value", Host}]},
  			{struct, [{"name", "user"}, {"value", User}]},
  			{struct, [{"name", "method"}, {"value", Method}]},
  