anchor.diff:  %%            Name   = string() "\"From\" or \"To\" or similar"
   %%            Header = #keylist{}
   %%
  -%% @throws  {sipparseerror, Type, Header, Status, Reason} 
  +%% @throws  {sipparseerror, Type, Header, Status, Reason}
   %%
   %% @doc     Check if the header Name (from Header) is parsable.
   %%          Currently we define parsable as parsable by
  
positive.code: %%            URI    = #sipurl{} | {yxa_unparsable, uri, {Error :: atom(), URIstr :: string()}}
  %%            Header = #keylist{}
  %%
  %% @throws  {sipparseerror, Type, Header, Status, Reason} 
  %%
  %% @doc     Check if we supported the URI scheme of a request. If we
  %%          didn't support the URI scheme, sipurl:parse(...) will
  
negative.code: 		    end
  	    end;
  	false ->
  	    %% Via doesn't match me, check next.
  	    via_indicates_loop(LoopCookie, CmpVia, Rest)
      end.
  