RE: [xml-dev] XML schema : refer problem

["Michael Kay" <mike@saxonica.com>]

Easy enough in XSD 1.1 (*)

On organisationType, define

xs:assert test="every $pp in ./person/poll satisfies
                 some $p in ./poll satisfies 
                    ($pp/@id = $p/@id
                      and every $a in $pp/answer satisfies $a/@id =
$p/question/@id)"

(*) Also easy to get it wrong - no guarantees offered!

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Geert Delanote [mailto:geert.delanote@gmail.com] 
> Sent: 22 April 2009 14:13
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] XML schema : refer problem
> 
> Suppose I have the following document :
> <?xml version="1.0" encoding="UTF-8"?>
> <organisation>
> 	<person id="1">
> 		<poll id="a">
> 			<answer id="1"/>
> 			<answer id="3"/>
> 		</poll>
> 	</person>
> 
> 	<poll id="a">
> 		<question id="1"/>
> 		<question id="2"/>
> 	</poll>
> 	<poll id="b">
> 		<question id="1"/>
> 		<question id="3"/>
> 	</poll>
> </organisation>
> 
> In my schema definition i want the following constraints :
> - a poll has a unique id within an organisation : key on id 
> in organisation scope : No Problem
> - a question has a unique id within a poll : key on id in poll scope :
> No Problem
> - a person can only answer a defined poll : keyref to the key of poll
> : No problem
> - a person can only answer questions of the referenced poll : ...
> problem ... How do I do that? The combination poll-id 
> question-id is unique but I can't define a key on that 
> combination which I need to refer to.
> 
> Extra question : how can I ensure that the person answers 
> every question?
> The question element contains lots of information that I 
> don't want to duplicate...
> 
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