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Re: XML Schema newbie - are multiple unordered children occurr

• To: Max Chappell <max@m...>
• Subject: Re: XML Schema newbie - are multiple unordered children occurrences possible?
• From: jcowan@r...
• Date: Tue, 2 Dec 2003 15:32:06 -0500
• Cc: xml-dev@l...
• In-reply-to: <3FCCF2F8.10601@m...>
• References: <20031202180028.GA24522@t...> <200312021807.hB2I7b528570@v...> <20031202190015.GA24640@t...> <084c01c3b90d$8ba11910$560bbed8@PREZ> <3FCCF2F8.10601@m...>
• User-agent: Mutt/1.4.1i

Max Chappell scripsit:

> I agree. The biggest shortcoming I have trouble with is the lack of any 
> if then construct. i.e.
> 
> Taking the example you gave -
> You can't say if <ParentNode> has @flavour='B' Then only allow child 
> elements of type <B>.
> 
> Tall order I know, but something I come up against on a daily basis.

Consider using RELAX NG, then, in which such things are easily accomplished
using fixed-value attributes and a choice.

If we wish to allow ParentNode to contain A children only if @flavour="A"
and likewise for B, then we write:

element ParentNode {
	(attribute flavour {"A"}, A*) |
	(attribute flavour {"B"}, B*)
	}

A = element A {...}

B = element B {...}

As before, the ellipses should be replaced by the attributes and content
model of the A and B elements.

-- 
Do what you will,                       John Cowan
   this Life's a Fiction                jcowan@r...
And is made up of                       http://www.reutershealth.com
   Contradiction.  --William Blake      http://www.ccil.org/~cowan

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    • From: Amelia A Lewis <amyzing@t...>
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    • From: Max Chappell <max@m...>

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