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Fwd: XMLSchema from Charles Campbell on 2000-05-27 (www-xml-schema-comments@w3.org from April to June 2000)
Fwd: XMLSchema
- From: Charles Campbell <campbelc@informix.com>
- Date: Fri, 26 May 2000 23:17:39 -0700
- To: www-xml-schema-comments@w3.org
- Cc: cmsmcq@acm.org
- Message-Id: <4.2.0.58.20000526231141.00be5740@pop0>
Here are the comments I received from Mike Stonebraker. I have other within Informix looking at the document to see how they would affect the OR, Object Relational Model. I Hope this is the correct list to submit these comments on. Let me know if I need to do something else. Thanks, chuck >X-Sender: mike@pop.cohera.com >X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.5 (32) >Date: Fri, 26 May 2000 09:17:19 +0100 >To: herbach@informix.com >From: Mike Stonebraker <mike@informix.com> >Subject: XMLSchema >Cc: campbelc@informix.com, cto@informix.com > >I come from the following point of view. > >It must be possible to map XMLSchema into an OR Schema, so that a >"shredder" will work. In addition, it is highly desirable if the OR schema >can be updated directly (and not through XML). For example, one might want >to directly enter purchase orders and then export them as XML objects, >obeying XMLSchema. > >Hence, it is desirable if XMLSchema constraints can be mapped to OR >structural constraints and not supported by an ingest function. > >In this regard, the following stuff seems problematic: > >1) minoccurs and maxoccurs -- there is no corresponding SQL construct > >2) choice -- this is basically to support union types, and SQL doesn't have >them > >3) all -- allows items to appear in any order, and XML is order sensitive. >Not clear that there is an easy way to support this.... > >4) equivalence -- allows two types to be declared equivalent -- no >corresponding construct in SQL. > >There are probably some more cases that are ugly -- these are just the ones >that occured to me on a quick reading of the XMLSchema document. > >/mike ===================================================== Charles E. Campbell --- Standards & Language Architect Informix Software, Inc. Phone +1.510.628.3908 300 Lakeside Drive Email: campbelc@informix.com Oakland, CA 94612 Fax: +1.510.628.3736 USA Personal FAX +1.916.988.6092 Personal Phone +1.916.988.3501 Personal Cell +1.916.300.1205 Personal email: campbelc@ix.netcom.com ===================================================== = Any opinions expressed are the opinions of myself and may or may = not reflect the opinions of anyone else or the company I represent. =====================================================
Received on Saturday, 27 May 2000 02:21:22 UTC