[VCARDDAV] PREF interoperability

Simon Perreault <simon.perreault@viagenie.ca> Wed, 03 November 2010 20:28 UTC

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Date: Wed, 03 Nov 2010 16:28:22 -0400
From: Simon Perreault <simon.perreault@viagenie.ca>
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Subject: [VCARDDAV] PREF interoperability
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On 2010-10-12 02:42, Rohit Khare wrote:
> * PREF reminds me of content-negotiation in HTTP. It was a beautiful
> idea that was convoluted too far to really ever work. The similarities
> begin with the arbitrary 0-100 scale (oops! 1-100 see? and 1 > 100,
> don’t forget — this kind of scaling jiggery-pokery is unlikely to
> interoperate, much less compose (concatenating records from multiple
> sources). Where is the actual reference to a running system with that
> much subtlety of expression?

At this late stage in the process, we need concrete and explicit
proposals. I can't find one in this (still interesting and valuable)
comment.

Here's the history behind PREF, for your information:

The PREF parameter has been in vCard since at least 2.1 (maybe earlier)
and is widely implemented. What was added in vCard 4 is the integer
value. The ability to quantify and express relative preference was one
of the first feature requests for vCard 4. The 1-100 range was picked
with guidance from OMA and made working group consensus. In earlier
versions of the draft (-06 and earlier), there was no range (just
"positive integer"). Also, the use of zero was ruled out because
indicating top priority with PREF=0 would surely cause a lot of confusion.

Simon
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