Michael Kay wrote:
Here are some expressions that the 1.0 syntax allows
but the data typing rules prohibit:
1/fred
fred/1
count(3)
4 | 5
Turns out Jaxen was flaking out on half of those (returning
empty lists
instead of throwing an exception). I've now fixed them. Are there any
other kinds of BNF-correct but datatype-forbidden expressions
in XPath
1.0 I should be watching out for?
XPath 1.0 is generally designed to be free of run-time errors - i.e. if you
make a mistake it returns garbage rather than reporting an error. The only
type conversion it won't attempt is converting an atomic value (in 2.0
parlance) to a node-set. The above examples all exploit this: they are all
functions/operators that expect a node-set but are given an atomic value. I
can't offhand think of any others, except simple variations like replacing
count() by sum().
Michael Kay
http://www.saxonica.com/
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