Re: [Uri-review] Request for review

["Henry S. Thompson" <[e-mail]>]

Timothy Mcsweeney writes:

> This is a request for a review of the 'drop' URI scheme.  The
> draft can be found here

> https://datatracker.ietf.org/doc/draft-mcsweeney-drop-scheme/

Without commenting on any other aspect of the proposed scheme, and
mostly just to save people time, I found the following aspect of the
proposal somewhat misleading:

  "Similar to the previously registered 'tel' [RFC3966] and
   'leaptofrogans' [RFC8589] URIs, the 'drop' URI scheme is
   syntactically correct but does not need to use all 5 of the
   parse-able components available to it.  The 'drop' scheme uses the
   number sign '#' as a general delimiter as seen in Appendix
   A. Collected ABNF [RFC3986].  The scheme syntax is as follows:

  "   drop-uri = 'drop#' character string

            drop   #    fg34htx
            \__/  \_/   \_____/
             |     |       |
         <scheme>  |  <scheme-specific-part>
               <gen-delim>
  "

I read this as implying that

  1) 'tel' and 'leaptofrogans' URIs did not begin "tel:" and
     "leaptofrogans:";
  2) The 3986 ABNF for URIs recognises "drop#fg34htx" as a URI.

Neither of these is in fact that case.  The two referenced schemes
require ':' after the 'scheme' component, and the 'URI' production does
_not_ recognise the above example.  (The 'URI-reference' production does,
but not using the 'scheme' production to cover the "drop" part.)

ht 
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
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