[Schematron] Rule context expression doubt

[Lars Huttar]

On 1/2/2009 5:18 AM, Luis Costa wrote:
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> I’ve a XML 1) and I need to implement for instance role described in 2)
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> XML 1)
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> <MediaDB>
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>   <DVD label="DVD">
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>       <Identifier>
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>           <key value="1"/>
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>       </Identifier>
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>       <Director value="J.S. Bach"/>
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>   </DVD> 
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>   <DVD label="DVD">
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>      <Identifier>
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>          <key value="2"/>
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>      </Identifier>
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>      <Director value="Stanley Kubrick"/>
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>   </DVD>
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> </MediaDB>
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> 2)
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> <rule context=”DVD/ Identifier/ key[@value=2]/../ Director ">           
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>             <assert test="@value=’Stanley Kubrick’”/>
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>  </assert>
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> For instance I need to check that:
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> The director of DVD/ Identifier/ key[@value=2] is “Stanley Kubrick”
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> I think I really have to use in context rule “/../” expression but I’m
> getting the following error:
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> “error in expression” when using “/../” in context expression,
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> Question:
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> Is there a valid expression similar than “/../” to use in context rule
> that allows climbing a level in XML?
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>  

I'm not sure I know about using ".." in a context pattern, but your
context expression could be expressed as

<rule context=”DVD[Identifier/key[@value=2]]/Director">
         <assert test="@value=’Stanley Kubrick’”/>

Does that work?


Incidentally, it seems strange that you would be establishing a whole
unique context just for a single Identifier value of a DVD... but maybe
that's just an example that doesn't actually reflect the nature of your XML.

HTH,
Lars