:rule context=" " subject=" "

[dinodc]

Are there more example to use the "subject within rule context? (<sch:rule context="blah/blah/blah" subject=""> )

See, I was task to be more specific..have a way to check if a value is there, if so, then run "assert" within the <pattern>.

We know <rule context=" "> is where the context attribute is. But we want to have like a IF-Statement or if value is there then go ahead and run the <pattern>, If not, don't proceed on.

[Jamil]

I don't have an example where subject is used; however, can't you do what you are looking for with XPath criteria within the context attribute?

Something like this:

Code: Select all

    <pattern>

        <rule context="/node/subNode[@atttibute='TARGET'][count(@attributeThatMustExist)>0]">

            <assert test=".!='whatever'">Error condition</assert>

        </rule>

    </pattern>

[dinodc]

Thanks Jamil.

I like how you have the "[count(@attributeThatMustExist)>0]". But my problem is this. I want to check that the attribute is located in another node. If it does, then in a different node I want to run the assert to test that node/subnode's Properties exist. The reason is that to run the assert test, those properties are only for those that particular 1st node.

Here is a more generic term without going into my work's elements.

Node
Car->Toyota->Prius
Car->Ford->Mustang
Suv->Ford->Explorer

Node
Gas--attributes: 1)Mileage on gas, 2)Total Mileage distance
Hybrid--attribute: 1) Mile on electric, 2)Mileage on city, 3)mileage on highway.

See, due to Prius is a Hybrid I just want to test the hybrid part and the Prius should not run through the gas element. In the Node with gas...I need check in "sch:rule context" to look at the Node Car. I guess its checking for its reference.

Is that a little help?

[Jamil]

Okay. Try this:

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<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">

    <pattern>

        <rule context="//*[count(@MileageOnElectric)>0]">

            <assert test="./@MileageOnCity > 30 or ./@MileageOnHighway > 50">Poor mileage for a hybrid</assert>

        </rule>

        <rule context="//*[count(@MileageOnGas)>0]">

            <assert test="./@TotalMileageDistance > 60">Poor mileage for a gasolene vehicle</assert>

        </rule>

    </pattern>

</schema>

This worked against a test document I created below:

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<?xml version="1.0" encoding="UTF-8"?>

<?xml-model href="schematron_question2.sch" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>

<auto>

    <Car>

        <Toyota>

            <Prius MileageOnElectric="30" MileageOnCity="35" MileageOnHighway="10"/>

        </Toyota>

        <Ford>

            <Mustang MileageOnGas="15" TotalMileageDistance="80"/>

        </Ford>

    </Car>

    <Suv>

        <Ford>

            <Explorer MileageOnGas="10" TotalMileageDistance="61"/>

        </Ford>

    </Suv>

</auto>

You'll want to run some performance tests with this against large XML documents due to using //*

[dinodc]

Thanks....I will try later. But many thanks and I will keep you updated!

[Jamil]

No problem. Taking a second look at this, the or in my first assert test should really be an and. This revised schema resolves the issue:

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">

    <pattern>

        <rule context="//*[count(@MileageOnElectric)>0]">

            <assert test="./@MileageOnCity > 30 and ./@MileageOnHighway > 50">Poor mileage for a hybrid</assert>

        </rule>

        <rule context="//*[count(@MileageOnGas)>0]">

            <assert test="./@TotalMileageDistance > 60">Poor mileage for a gasolene vehicle</assert>

        </rule>

    </pattern>

</schema>