Article:		Combining RELAX NG and Schematron
Subject:		Combining schema languages
Date:		2004-02-23 11:38:43
From:		Eddie Robertsson
Response to: Combining schema languages
Hi Mark, I haven't looked at XForms but I have played around with WXS and Schematron. It works pretty much the same as Relax NG and Schematron and the two differences are: 1) The Schematron declarations are embedded within the xs:appinfo element. 2) You use a different extractor stylesheet to extract the Schmematron declarations (XSD2Schtrn.xsl). The stylesheet is available here: http://www.topologi.com/public/Schtrn_XSD/XSD2Schtrn.zip

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• Combining schema languages
  2004-02-27 05:47:18 Mark Seaborne
  
  Eddie,

  
  Okay, that's an interesting approach.

  
  If you used XForms you leave the schema alone, but reference it in an XForms model:

  
  <xfm:model id="myModel" schema="mySchema.xsd">

  
  You then define Model Item Properties that add additional constraints:

  
  <xfm:bind nodeset="purchaseOrder/items/item" constraint="number(price) * number(quantity) = number(totalAmount)"/>

  
  In addition to constraint, you can use "calculate", "relevant", "required", "readonly", "type" (apply a WXS type) and "p3ptype"

  
  XForms' instance() function allows you to define MIPs that involve multiple XML instances, if you so wish.

  
  I quite like the fact that the XForms model is non-intrusive, allowing you to build on a schema without needing read access to the schema.

  
  However you do it though, it is undoubtedly useful to be able to express

  
  All the best

  
  Mark