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Re: [Json] JSON Schema Language

John Cowan <cowan@ccil.org> Sat, 11 May 2019 00:41 UTC

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From: John Cowan <cowan@ccil.org>
Date: Fri, 10 May 2019 20:40:49 -0400
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To: Phillip Hallam-Baker <ietf@hallambaker.com>
Cc: Erik Wilde <erik.wilde@dret.net>, Carsten Bormann <cabo@tzi.org>, JSON WG <json@ietf.org>, Pete Cordell <petejson@codalogic.com>, Ulysse Carion <ulysse@segment.com>
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Subject: Re: [Json] JSON Schema Language
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On Fri, May 10, 2019 at 9:31 AM Phillip Hallam-Baker <ietf@hallambaker.com>
wrote:


> XML has many features that are bogus. The distinction between elements and
> attributes for example. But they were in SGML and XML couldn't drop them.
>

There were a *huge* number of things in SGML that XML dropped.  Not enough,
I agree.  But the difference between elements and attributes is the
difference between ordered content (which documents need) and
not-so-ordered properties (which documents also need).

Here are two approaches to simplifying XML that I like very much.

MicroXML is a subset of XML, as XML is a subset of SGML.  See <
https://dvcs.w3.org/hg/microxml/raw-file/tip/spec/microxml.html>.  The spec
is 10 pages long including a data model.

FtanML is syntactically different and semantically more flexible: it would
make a good replacement for both XML and JSON.  See <
https://www.balisage.net/Proceedings/vol10/html/Kay01/BalisageVol10-Kay01.html>.
("Ftan" is a village in Switzerland where the language was developed, not
an acronym.)   The spec is 27 pages long, including a data model, a schema
language, and a transformation language.


> XML was an attempt to get rid of as much of the stupid from SGML as
> possible. XSD was a necessary part of enabling XML.
>

I can't agree with you there.  RELAX NG would have been just as usable for
the purpose.


John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
At times of peril or dubitation,
Perform swift circular ambulation,
With loud and high-pitched ululation.

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