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You could do this with Schematron if you were willing to resort to extension functions. But you lose portability if you do that. Extension functions are implementation dependent and are not standardized. If you go that route, check your XSLT implementation's docs for how to do this. -----Original Message----- From: PH To: xml-dev@l... Sent: 3/1/02 5:54 AM Subject: XML validation using mathematical expressions Hello, I am new to this interest group and I have just familiarized myself with the XML basic concepts and schema validation so bear with me;-) So far, I have only got theoretical knowledge gained by reading articles, tutorials (I found Roger Costello's schema tutorial and best practice guide really useful) and XML books. I have learned that you can put a lot of control over XML instance documents by properly typing and constraining elements in XML schemas. I have also learned that you can extend the schema by enforcing correlation constraints (A > B) by using other schema's such as Schematron based on XSLT templates. However, I'd like to take it a step further by introducing non-linear relationships between elements using mathematical expressions. For example, I would like to validate that element B < A/sqrt(2). I'd appreciate any help from the XML development community in achieving this. Would MathML be of any help? TIA Paul van Hagen ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://lists.xml.org/ob/adm.pl>
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