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Re: [Json] JSON Schema Language

Nico Williams <nico@cryptonector.com> Tue, 07 May 2019 21:54 UTC

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Date: Tue, 07 May 2019 16:54:31 -0500
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From: Nico Williams <nico@cryptonector.com>
To: Phillip Hallam-Baker <ietf@hallambaker.com>
Cc: Erik Wilde <erik.wilde@dret.net>, Austin Wright <aaa@bzfx.net>, Anders Rundgren <anders.rundgren.net@gmail.com>, Tim Bray <tbray@textuality.com>, JSON WG <json@ietf.org>
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Subject: Re: [Json] JSON Schema Language
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On Tue, May 07, 2019 at 05:48:46PM -0400, Phillip Hallam-Baker wrote:
> On Tue, May 7, 2019 at 5:29 PM Erik Wilde <erik.wilde@dret.net> wrote:
> > [...]
> >
> 
> I disagree on the constraining facets part. The only values I have found
> useful to put in a schema are 0 or 1 minimum occurrences and 1 or infinity
> maximum occurrences.

+1e3

I've seen the option to have arbitrary Ns of relations in a database,
and the only min/max value pairs ever used are {0,1}, {1,1}, {0,max},
and {1,max}, where max is usually just a very large number (2^31 - 1 in
the case I have in mind).

> I don't have these constraints in any programming language I have used
> since I did formal methods 25 years ago. The only ones that did were Z and
> VDM.

+1e3

Nico
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