Re: XPath 2.0 Best Practice Issue: Graceful Degradation
if (exists(//air... Most of those tests could be simplified by just using the original simple xpath and checking that the resulting double wasn't NaN. In a real situation where one might be pulling several such values from an input source, surely you wouldn't want to obscure the program logic of every expression in this way. It would be much harder to spot if the wrong arithmetic is being used in your last exampel than in your first. If the input is validated (against xsd or relax or schematron or any other schema language of choice) the user will get specific error message about missing or incorrectly typed values at an earlier stage, before the calcualtion has been attempted. David ________________________________________________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. ________________________________________________________________________
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