[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML Schemas: Best Practices
Subject: Tutorial on Extending XML Schemas I have put together a step-by-step tutorial on extending XML Schemas (with either XSLT/XPath or Schematron). It contains fully worked examples, labs (with answers), and batch scripts for running the examples/labs. The tutorial may be downloaded from the Best Practice Homepage: http://www.xfront.com/BestPracticeHomepage.html The tandem of {XSLT/XPath and XML Schemas} or {Schematron and XML Schemas} is very powerful. I am very excited about this approach. Here's a preview of what is covered in the tutorial: - XML Schemas is very powerful - However, it is not "all powerful". There are many constraints that it cannot express. Here are some examples: . Ensure that the value of the aircraft <Elevation> element is greater than the value of the obstacle <Height> element. . Ensure that: - if the value of the attribute, mode, is "air", then the value of the element, <Transportation>, is either airplane or hot-air balloon, - if mode="water" then <Transportation> is either boat or hovercraft, - if mode="ground" then <Transportation> is either car or bicycle. . Ensure that the value of the <PaymentReceived> is equal to the value of <PaymentDue>, where these elements are in separate documents! - To check all our constraints we need to supplement XML Schemas with another tool. In this tutorial we cover each of these examples and show how the constraints may be implemented using either XSLT/XPath or Schematron. At the end we examine the pros and cons of each approach. ... I would like to thank Eddie Robertsson and Rick Jelliffe for helping me understand the wonderful power of Schematron. /Roger
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