Dynamic Validation

Roger Costello

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Run-time Validation

• In the examples considered up till now the XML instance documents were validated against the Schematron schema using a desktop tool such as Oxygen XML or Topologi.
• In a production environment we need to validate XML instances at run-time (by invoking an API).

Production Environment

1. An XML instance document is sent to a Web Server. 2. The Web Server forwards the document to some Code. 3. The Code invokes a Schematron Validator with the document, along with the apprpriate Schematron Schema. 4. The Schematron Validator validatates the document against the Schema, and returns the results to the Code.

Validation using XSLT

• There is an XSLT stylesheet which implements Schematron validation (skeleton1-5.xsl).
• An XML instance document can be dynamically validated against a Schematron schema by invoking any XSLT processor, such as SAXON or XALAN.

Step 1

• Invoke the XSLT processor with your Schematron Schema and the Schematron stylesheet (skeleton1-5.xsl).
• The output is another XSLT stylesheet!

An XSLT processor is invoked, with the Schematron Schema and skeleton1-5.xsl The output is Validation.xsl

Step 2

• Invoke the XSLT processor with your XML instance document and Validator.xsl (the output of Step 1).
• The output is the result from validating your XML instance document against the Schematron Schema!

An XSLT processor is invoked, with the XML instance document and Validation.xsl The output is the validation results.

Summary

An XSLT processor is invoked, with the Schematron Schema and skeleton1-5.xsl The output is sent back into the XSLT processor, along with the XML instance document. The output is the validation results.

Example

• View the example06 folder
• The DOS batch file, step1.bat, will invoke XALAN with check-classifications.sch and skeleton1-5.xsl and output the results to Validator.xsl
• The DOS batch file, step2.bat, will invoke XALAN with invalid-document.xml and Validator.xsl and output the results to Results.txt

Lab 7

• Rerun your last lab (lab 6), but this time use skeleton1-5.xsl and your favorite XSLT processor to perform the validation.