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Re: [Moderator Action] XML Schema for hierarchies

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 30 Nov 2000 10:00:46 +0000
To: Valery Zubovsky <valery.zubovsky@instill.com>
Cc: "'xmlschema-dev@w3.org'" <xmlschema-dev@w3.org>
Message-ID: <f5blmu16apd.fsf@cogsci.ed.ac.uk>
Valery Zubovsky <valery.zubovsky@instill.com> writes:

> Does this schema fragment make sense?
> 
> 	<complexType name="x">
> 		<element name="a" type="x"/>
> 	</complexType>
> 
> ... to represent the following structure:
> 
> 	<a>
> 		<a>
> 			<a/>
> 		</a>
> 	</a>

Sorry for slow reply, I've been on the road (at XML Schema meetings :-).

In principle, what you have is fine.  In practice, you need a bit more 
to make it completely OK:

 <xs:complexType name="x">
  <xs:sequence>
   <xs:element name="a" type="x" minOccurs="0"/>
  </xs:sequence>
 </xs:complexType>

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@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Thursday, 30 November 2000 05:00:51 GMT

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