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> 3. I want to write 2 sometimes using the entities which I've defined at the step 1.
>
> How can I do that ?
As many other pointed out, combination of Schematron + RELAX (or TREX or
whatever grammar-based language) is possible.
James showed a Schematron-driven combination, so I'll show RELAX-driven
combination.
You can add arbitary <assert> and <report> tag inside <elementRule>.
<elementRule label="foo">
<s:assert test="count(xxx)=1">
label 'XXX' always has 'xxx' as its tag name,
and it can only be appeared once.
</s:assert>
<sequence>
<choice occurs="*">
<ref label="XXX" />
<ref label="YYY" />
</choice>
<ref label="ZZZ" />
</sequence>
</elementRule>
And these assertions are checked with every element that has label "foo".
Probably, you want to use RELAX's labels and roles within XPath
expression. I think that's what you wanted to do.
But IMO, such RELAX-customized (or TREX-customized or whatever) XPath is
a kind of overkill.
regards,
----------------------
K.Kawaguchi
E-Mail: k-kawa@b...
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