> Are you using XSLT/XPath in a life-critical application such as controlling
a nuclear power plant or controlling an aircraft flight system?
>

Another observation on this: those are the classic examples of safety-critical
systems that everyone uses. But boring administrative systems, like one that
sends letters to patients telling them when their next cervical smear test is
due, are also safety-critical. Probably more deaths are caused by failures in
that kind of system than by failures in systems where the consequences of
failure are more immediate.

WHO report 2016: "A study of reported errors from five family practices in a
high-income country found that most reports contained administrative errors
and more than three-quarters had the potential of serious harm".

So let's change the question: Are you using XSLT/XPath in a life-critical
application such as sending appointment letters to hospital patients?

Michael Kay
Saxonica