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RE: URN as namespace URI for RDF Schema

From: Hammond, Tony <T.Hammond@nature.com>
Date: Mon, 4 Oct 2004 17:30:57 +0100
Message-ID: <125F7834E11A5741A7D79412EE3504F90CE55990@UK1APPS2.nature.com>
To: 'Graham Klyne' <GK@ninebynine.org>, mdirector@iptc.org, www-rdf-interest@w3.org

Hi Graham:

> It's true that URN's don't (strictly) allow '/' signs, but 
> they do not 
> prohibit '#' signs, as the fragment is not part of the main URI.  See 
> http://www.w3.org/DesignIssues/Model.html for some 
> discussion.  You could 
> include an escaped (using %hh) '/' in a URN.
> 

This from RFC 2141 (both "/" and "#" are reserved chars):

http://www.ietf.org/rfc/rfc2141.txt

2.3.2 The other reserved characters

   RFC 1630 [2] reserves the characters "/", "?", and "#" for particular
   purposes. The URN-WG has not yet debated the applicability and
   precise semantics of those purposes as applied to URNs. Therefore,
   these characters are RESERVED for future developments.  Namespace
   developers SHOULD NOT use these characters in unencoded form, but
   rather use the appropriate %-encoding for each character.

Cheers,

Tony



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Received on Monday, 4 October 2004 16:31:56 GMT

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