Re: [VCARDDAV] Cardinality notation
Cyrus Daboo <cyrus@daboo.name> Tue, 02 November 2010 13:54 UTC
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Date: Tue, 02 Nov 2010 09:54:27 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Simon Perreault <simon.perreault@viagenie.ca>, Tantek Çelik <tantek@cs.stanford.edu>
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Cc: vcarddav@ietf.org
Subject: Re: [VCARDDAV] Cardinality notation
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Hi Simon, --On November 2, 2010 9:17:03 AM -0400 Simon Perreault <simon.perreault@viagenie.ca> wrote: > How about not inventing our own and using something that people may have > already seen before? > > How about UML? > > 1 - exactly one instance must be present > 1..* - at least one instance must be present > 0..1 - at most one instance may be present > * - any number of instances may be present Or something more familiar in the IETF - ABNF style: 1 - exactly one instance must be present 1* - at least one instance must be present *1 - at most one instance may be present * - any number of instances may be present Though that is perhaps a little less readable than what you proposed. Anyway, by using ABNF, that does allow flexibility in the future of using more complex cardinality rules, e.g. 1*3 etc. It maybe that one day we will actually have a proper, complete ABNF for vcard. -- Cyrus Daboo
- [VCARDDAV] Cardinality notation Simon Perreault
- Re: [VCARDDAV] Cardinality notation Cyrus Daboo