Using XPath 2.0 with Schematron

Roger Costello

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Using XPath 2.0 with Schematron

• Recall that a Schematron assertion is made using an XPath expression
• Thus far we have been using XPath 1.0 to express assertions
• Alternatively, you can express assertions using XPath 2.0

Validators

• Oxygen XML supports using Schematron with XPath 2.0
• As of May 2007, Topologi does not support using Schematron with XPath 2.0

Using XPath 2.0 in Oxygen XML

• By default, Oxygen uses XPath 1.0
• To switch to XPath 2.0 do this:
  • Under Oxygen's Options menu, select Preferences
    • Under XML, select XML Parser
      • Under "Schematron XPath Version", click on 2.0

Example

• An aircraft's takeoff datetime must be before its landing datetime.
• This co-constraint in expressed in check-times.sch (example10 folder).
• Note that the schema's assertion uses the XPath 2.0 "lt" (less than) comparison operator.
• Validate valid-document.xml and invalid-document.xml (example10 folder) against the schema using Oxygen XML. Be sure to set Oxygen to use XPath 2.0 (see previous slide).