Re: Publication request for draft-spinosa-urn-lex

worley@ariadne.com (Dale R. Worley) Mon, 15 December 2014 19:11 UTC

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From: worley@ariadne.com (Dale R. Worley)
To: francesconi@ittig.cnr.it, urn-nid@ietf.org, andy@hxr.us, pierluigi.spinosa@ittig.cnr.it
Subject: Re: Publication request for draft-spinosa-urn-lex
In-Reply-To: <CALaySJL4SPUg48G=qXNm1g5TZySOb3efkcqs59zLi2z69Ag24A@mail.gmail.com> (barryleiba@computer.org)
Sender: worley@ariadne.com (Dale R. Worley)
Date: Mon, 15 Dec 2014 14:11:29 -0500
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There are at least some technical questions that need to be addressed.

1) The ABNF in appendix A contains <national-name>, but it seems to be
intended to be what is described as <local-name> in section 4.3.

2) The use of % for escaping is incompatible with the generic syntax of
URNs:

      encoded   = "%" (1*6DIGIT / ("x" 1*6HEXDIG))  
                                 ; Hexadecimal digits (0-9, A-F)

as opposed to:

   pct-encoded   = "%" HEXDIG HEXDIG

3) The syntax for using % does not allow an encoded string to be parsed
unambiguously:

   jurisdiction-unit = alfanum *normal

   normal = alfanum / "."

      alfanum   = lowercase / DIGIT / encoded

      lowercase = %x61-7A        ; lower-case ASCII letters (a-z)
                                 ; DIGIT %x30-39 decimal digits (0-9)

      encoded   = "%" (1*6DIGIT / ("x" 1*6HEXDIG))  
                                 ; Hexadecimal digits (0-9, A-F)

For example, considering the string "x%1234" as a <jurisdiction-unit>,
it could be one <lowercase> followed by a <DIGIT> and three <encoded>s
("x", "%1", "2", "3", "4") or one <lowercase> followed by one <encoded>
("x", "%1234").

Perhaps this does not matter if it is not required that the underlying
UTF-8 string can be derived from the URN, but if so, then there is no
assurrance that two distinct UTF-8 string will be encoded as distinct
URN substrings.

Dale