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Re: XML Schemas: Best Practices

  • From: ht@c... (Henry S. Thompson)
  • To: Richard Lanyon <rgl@d...>
  • Date: Thu, 21 Sep 2000 16:19:33 +0100

rgl d
Richard Lanyon <rgl@d...> writes:

> On Wed, 20 Sep 2000, Roger L. Costello wrote:
> 
> [introduction to elementFormDefault="unqualified" snipped]
> 
> > Here's an example of a conforming instance document:
> > 
> > <?xml version="1.0"?>
> > <my:camera xmlns:my="http://www.camera.org"
> >                xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"
> >                xsi:schemaLocation= "http://www.camera.org Camera.xsd">
> >         <body>Ergonomically designed casing for easy handling</body>
> >         <lens>300mm zoom, 1.2 f-stop</lens>
> >         <manual_adaptor>1/10,000 sec to 100 sec</manual_adaptor>
> > <my:camera>
> 
> Isn't there a problem here?
> A document author may well see a document like the above and
> try and rewrite it using a default namespace, thus:
> 
> <?xml version="1.0"?>
> <camera xmlns="http://www.camera.org">
> <body>Stuff</body>
> <lens>More stuff</lens>
> <manual_adaptor>Even more stuff</manual_adaptor>
> </camera>
> 
> Except (assuming I understand this correctly, which is far from
> guaranteed) that won't validate, because body, lens and manual_adaptor
> are now qualified and in the wrong namespace. I'd suggest this is far
> from intuitive for a document author, unless he/she knows how the
> schema works, and the whole idea is that the author should be
> insulated from the complexities of the schema.

Your analysis is correct.  Unqualified local elements and default
namespace declarations don't mix well.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/

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