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Re: How to make simple type choice

From: Michael Kay <mike@saxonica.com>
Date: Fri, 27 Aug 2010 23:14:01 +0100
Message-ID: <4C7838A9.2070803@saxonica.com>
To: Karl Stubsjoen <kstubs@gmail.com>
CC: xmlschema-dev@w3.org
  You can use xs:assert for this, but conditional type assignment is 
probably a closer fit to the requirement - it's specifically designed to 
allow you to validate the element contentagainst a type chosen on the 
basis of the value of an attribute

<xs:element name="queries">
<xs:alternative test="@name='test1'" type="type1"/>
<xs:alternative type="type2"/>

On the other hand, I often find xs:assert easier even in cases like 
this. Here it would be something like this:

<xs:assert test="every $q in query satisfies
                                    $q/@name = if (@name='test1')
('somename1', 'somename2')
('somename2', 'somename3')"/>

Note, with Saxon it's always a good idea to express assertions using 
"every X satisfies", because Saxon treats them specially from the point 
of view of diagnostics - you will get a list of the query elements (with 
line numbers) that don't satisfy the condition.

Michael Kay

On 27/08/2010 10:11 PM, Karl Stubsjoen wrote:
> I need to make a choice between various simple types for an attribute.
>   The xml may look something like this:
> <project>
> <queries name="test1">
>    <query name="somename1"></query>
>    <query name="samename2"></query>
> </queries>
> <queries name="test2">
>    <query name="somename2"></query>
>    <query name="samename3"></query>
> </queries>
> </project>
> So basically a queries node named "test1" will have a query node with
> an enumeration restriction of:
> somename1
> somename2
> And, a queries node named 'test2" will have a query node with an
> enumeration restriction of:
> somename2
> somename3
> How do you achieve this?  I'm looking at xs:assert but not sure I'm on
> the right path.
> Thanks,
> Karl..
Received on Friday, 27 August 2010 22:14:34 UTC

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