Re: is this a job for schematron?

On Tue, Apr 06, 2004 at 11:53:54AM +0100, Peter Aberline wrote:
> I want my schema to define the following rules:
> 
> 1: The letters element must contain a, b, and c elements in any order.
> 2: The letters element can also contain any number of other elements, in
> any order, such as dog, cat, fish etc.
[...]
> Instead, would it be better to define a schema that allows any elements
> under letters, and then use schematron to test if particular elements are
> there, and of the correct datatype? Can schematron do this? Any advice
> would be greatly appreciated.

I believe datatypes are a problem since Schematron builds on XPath 1
which is not datatype aware. Things might be different with XPath 2.

However, you want to assert that a, b, and c are present (besides
other possible elements), so you could use something like this:
<rule context="letters">
   <assert test="count(a)=1">letters must contain one a element</assert>
   <assert test="count(b)=1">letters must contain one b element</assert>
   <assert test="count(c)=1">letters must contain one c element</assert>
</rule>

Hope that helps,
Oliver


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|  ob|do        Dipl.Inf. Oliver Becker                             |
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