[xml-dev] XPath question with regards to Schematron rule

[Paul Popiel <PaulP@advancedengine.com>]

Hi,

If i have a XML stucture like so:

<A>
  <B>
  </B>
  <C>
    <D name=test num=3>
    </D>
    <E>
       <F name=one ref=test>
           <G></G>
           <G></G>
           <G></G>
       </F>
       <F name=two ref=test>
           <G></G>
           <G></G>
       </F>
</A>


how can i write a schematron rule to test that each <F> element has the
right number of <G> elements in it with respect to the value of the num
attribute in the <D> element with the same name as that of the <F> elements
ref attribute.

so with respect to the above example <F> elements one and two both have ref
"pointing" to element <D> test, where num=3
so both <F> elements should have 3 <G> elements

so in this case <F> two should signal an error when the schematron rule is
run.


In terms of the schematron rule:

				<sch:pattern name="Correct number of G in
F.">
					<sch:rule context="/">
						<sch:assert
test="????">Incorrect number of G.</sch:assert>
					</sch:rule>
				</sch:pattern>

what would be in the test attribute?

also i would like to work with absolute paths if possible.

ive tried all sorts of things using //F[count(G) = etc etc but i just cant
seem to get something working.

any help would be greatly appreciated

thanks

Paul Popiel
Software Engineer

Advanced Engine Components Limited
14 Energy St, Malaga WA 6090
Fax: +61 8 9209 6999
Mob: 0412 657 051
mailto:paulp@advancedengine.com
http://www.advancedengine.com



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