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   RE: [xml-dev] Validation of missing elements in xml:

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  • To: xml-dev@lists.xml.org
  • Subject: RE: [xml-dev] Validation of missing elements in xml:
  • From: Eric van der Vlist <vdv@dyomedea.com>
  • Date: Mon, 03 Apr 2006 17:39:19 +0200
  • In-reply-to: <20060403153140.2F9F57F573F@gwparis.dyomedea.com>
  • Organization: Dyomedea (http://dyomedea.com)
  • References: <20060403153140.2F9F57F573F@gwparis.dyomedea.com>

Le lundi 03 avril 2006 à 16:26 +0100, Michael Kay a écrit :
> With a DTD, there are very few ways to constrain the textual content of an
> element (you can constrain it to be EMPTY, but not to be non-empty).
> In XML Schema, you can declare the element to be of type my:non-empty-string
> where my:non-empty-string is a simple type derived from xs:string using the
> facet <minLength value="1"/>

True, but that depends what you call "empty"...

Deriving from xs:string won't catch cases where you only have
whitespaces such as;


If this should be considered invalid (which happens to be consistent
with the behavior of other datatypes), you should derive form xs:token
instead of xs:string...

Eric (caught on one of his most frequent rants again)

GPG-PGP: 2A528005
Did you know it? Python has now a Relax NG (partial) implementation.
Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
(ISO) RELAX NG   ISBN:0-596-00421-4 http://oreilly.com/catalog/relax
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema

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