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Re: [Jsonpath] JSNOPath Interim meeting next week

Stefan Gössner <stefan@goessner.net> Tue, 26 April 2022 07:48 UTC

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Date: Tue, 26 Apr 2022 09:47:42 +0200
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To: Greg Dennis <gregsdennis@yahoo.com>, cabo@tzi.org, Glyn Normington <glyn.normington.work@gmail.com>
Cc: Tim Bray <tbray@textuality.com>, jsonpath@ietf.org
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From: Stefan Gössner <stefan@goessner.net>
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Subject: Re: [Jsonpath] JSNOPath Interim meeting next week
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Yes, that run-time aspect is an important point. So then filters might 
be implemented so, that after the first (at least one !) match they 
return that single node-value in question.

Am 26.04.2022 um 09:37 schrieb Greg Dennis:
> A singular path should be run-time-determined.  If the path returns a 
> single value, it's singular for that data.  This works for dinner 
> expressions (comparisons) as well as a base definition for further 
> refinement in normalized paths.  Comparisons against multi-results 
> just return false (for now; we may want to expand and define this later).
>
> This means that there's not a specific subset of the syntax that can 
> define a singular path, but I think that's fine.
>
> Greg
>
>     On Tue, 26 Apr 2022 at 7:20 pm, Carsten Bormann
>     <cabo@tzi.org> wrote:
>     On 26. Apr 2022, at 09:13, Glyn Normington
>     <glyn.normington.work@gmail.com> wrote:
>     >
>     > Nested filters are disallowed because only Singular Paths are
>     allowed inside filter expressions.
>
>     Oh.
>
>     The text about singular paths is only about comparisons (they were
>     needed so paths can be used to yield singular JSON values).
>
>     I missed that the grammar now also limits exists-expressions to
>     singular paths.
>
>     Are we sure that this is what we want?
>     There is no reason for this limitation.
>     (Well, unless you want to rule out using exists-expressions for
>     checking “at-least-one” conditions.  Which I didn’t know we wanted.)
>
>     Grüße, Carsten
>
>
>     -- 
>     JSONpath mailing list
>     JSONpath@ietf.org
>     https://www.ietf.org/mailman/listinfo/jsonpath
>

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