Subject: Re: [xsl] How do you ensure that data is not altered/corrupted in a transformation? From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 19 May 2023 10:13:22 -0000 |
Testing, testing, testing. Plus tools to help prevent the mistakes arising in the first place. Schema validation can catch a lot of the errors, but it won't catch them all. We had a case like this where a customer was flagging up dangerous levels of some reading in medical reports by displaying the relevant figures in red. When they upgraded from XSLT 1.0 to 2.0, the test $level > $dangerLevel started doing a string comparison rather than a numeric comparison, with the effect that the red flags weren't appearing -- and it took them months to notice, because they weren't doing enough testing. Hopefully no-one died. Tests are the only answer: and because stylesheets can be thrown together quickly, people often neglect to follow good software engineering disciplines when changing them. Michael Kay Saxonica > On 19 May 2023, at 09:37, Roger L Costello costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hi Folks, > > In certain domains loss of life may occur if data is altered/corrupted in any way. > > Suppose you write an XSLT program which transforms this: > > <alt>12000 feet</alt> > > to this: > > <altitude>12000 feet</altitude> > > How do you ensure that the data -- 12000 feet -- was not altered/corrupted in the transformation? > > I have heard of people doing a hash on the data prior to the transformation, a hash on the data after the transformation, and then comparing the hashes. Is that what you would do when lives are on the line? What is your recommendation? > > /Roger
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