Subject: Re: [xsl] How do you ensure that data is not altered/corrupted in a transformation? From: "Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 19 May 2023 11:36:47 -0000 |
XSpec is a unit testing framework for and in XSLT. Its capabilities go far beyond what schema validation was ever intended to do. Roger, if you aren't using XSpec, you should be. https://github.com/xspec/xspec/wiki Regards, Wendell On Fri, May 19, 2023 at 6:13b/AM Michael Kay mike@xxxxxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > 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 > > > > > > > -- ...Wendell Piez... ...wendell -at- nist -dot- gov... ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org... ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
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