Re: #Announce published JXML schema, an XML schema forreprese

From: Michael Kay <mike@saxonica.com>
To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
Date: Thu, 03 Feb 2011 15:59:49 +0000

Play the video

On 03/02/2011 14:08, David Lee wrote:

003f01cbc3ab$e6d4a2b0$b47de810$@calldei.com" type="cite">

I’ve had this working for a while but finally got around to publishing the specs.

http://xml.calldei.com/JsonXML

This is currently implemented in the xml2json and json2xml commands in xmlsh (http://www.xmlsh.org)

The goal of this schema is a direct mapping in XML to the JSON data model, NOT a “nice XML transformation of JSON”.

( I’m working on that separately which I hope to publish later this year).

This is extremely simple (intentionally) and should be easy to implemented in most languages.

----------------------------------------

David A. Lee

dlee@calldei.com

http://www.xmlsh.org

Looks good. I share John's aesthetic objections to upper-case element names.

It would be easy enough to add to the schema the constraint that the names of members in an object must be unique.

It seems rather odd that BOOLEAN should be an enumerated string rather than an xs:boolean.

It also seems odd to use trivial restrictions of xs:double and xs:string rather than using xs:double and xs:string themselves.

You get slightly better schema-aware XSLT and XQuery processing capability if you make "value" an abstract element heading a substitution group, rather than a choice group (it means you can match it using "schema-element(value)").

You need to say whether strings are held in JSON format (with backslashes) or are unescaped. You're damned if you do, damned if you don't: if you try to do unescaping then you hit the nastiness that JSON can contain \0 which can't be represented directly in XML.

We're working on parse-json() and serialize-json() for XSLT 3.0 right now. At present we're converting to new map/array data structures rather than XML trees, but this could well be an alternative.

Michael Kay
Saxonica

Follow-Ups:
- Re: #Announce published JXML schema, an XML schema forrepresenting the JSON data model
  - From: John Cowan <cowan@mercury.ccil.org>
- RE: #Announce published JXML schema, an XML schema for representing the JSON data model
  - From: "David Lee" <dlee@calldei.com>

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