Re: [apps-discuss] Question about URI template and expansion of an empty list

James M Snell <jasnell@gmail.com> Fri, 26 April 2013 17:28 UTC

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From: James M Snell <jasnell@gmail.com>
Date: Fri, 26 Apr 2013 10:27:58 -0700
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To: Erik Wilde <dret@berkeley.edu>
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Cc: Joe Gregorio <joe@bitworking.org>, "apps-discuss@ietf.org" <apps-discuss@ietf.org>
Subject: Re: [apps-discuss] Question about URI template and expansion of an empty list
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Nope, it works. I've maintained that the spec is fine like it is ;-)
Honestly, I never really saw where the confusion was.

On Fri, Apr 26, 2013 at 10:20 AM, Erik Wilde <dret@berkeley.edu> wrote:
> hello joe.
>
> thanks for the response!
>
>
> On 2013-04-17 07:03 , Joe Gregorio wrote:
>>
>> On Mon, Apr 8, 2013 at 1:41 AM, Erik Wilde <dret@berkeley.edu> wrote:
>>>
>>>
>>> https://github.com/dret/uritemplate-test/blob/master/spec-examples-by-section.json
>>> (line 234) says it's "X", but i am really interested in the "why"
>>> explanation as well. http://tools.ietf.org/html/rfc6570#section-3.2.5
>>> says
>>> that
>>
>> The answer is in the text you quote:
>> "for each defined variable in the variable-list, append '.' to the
>> result string and then perform variable expansion"
>> The set of variables in the variable list is the empty set, so no '.'
>> is appended.
>> I agree that if this is confusing an addendum is in order.
>
>
> ... and just when i wanted to submit an erratum and searched for the best
> place where to put clarifying text, i ran into the last paragraph of
> http://tools.ietf.org/html/rfc6570#section-2.3 :
>
> "A variable defined as a list value is considered undefined if the list
> contains zero members. A variable defined as an associative array of (name,
> value) pairs is considered undefined if the array contains zero members or
> if all member names in the array are associated with undefined values."
>
> while still being a bit of an unintuitive definition for me, it seems as if
> this particular paragraph was never mentioned in previous discussions, and
> indeed clarifies that an empty array should be considered as an "undefined
> variable". for now, i'll assume that this settles things and will not file
> an erratum. but if people think (fracis? james?) that this still isn't good
> enough, then please speak up.
>
> thanks and cheers,
>
>
> dret.
>
> --
> erik wilde | mailto:dret@berkeley.edu  -  tel:+1-510-2061079 |
>            | UC Berkeley  -  School of Information (ISchool) |
>            | http://dret.net/netdret http://twitter.com/dret |
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