is there a similar construct to if-statements in xsd?

dhsmd · March 24th, 2009, 08:37 AM

Is it possible to use a xsd schema against an xml file that validates the xml file in the following ways:
1. if coursecode is empty, location must equal 8
2. if signupdate < todaysdate then totalpayment = amount - 100

Thanks

Martin Honnen · March 24th, 2009, 08:46 AM

The W3C XML schema language in version 1 does not allow you to model such constraints.
You might want to try Schematron instead. And the version 1.1 of the W3C schema language that is under development will allow you to model such constraints too I think.

mhkay · March 24th, 2009, 08:59 AM

Not in XSD 1.0. In 1.1 (you can try it out with Saxon-SA 9.1) you can write assertions, for example

<xs:assert test="coursecode != '' or location eq 8.2"/>
<xs:assert test="signupdate ge current-dateTime() or totalpayment = amount - 100"/>