On 28/02/2022 18:50, George Joseph via xslt wrote:
> I've been having a heck of a time trying to pass a parameter
> to xsltApplyStylesheet
> that has namespaces in the xpath _expression_.
This use case is simply not supported.
Okaaaaay.
> Finally I did find a workaround by calling xsltNewTransformContext() then
> iterating
> over the nsDefs in the stylesheet document and calling xmlXPathRegisterNs on
> ctxt->xpathCtxt for each nsDef.
I'm a bit puzzled that this worked at all. See the code here:
https://gitlab.gnome.org/GNOME/libxslt/-/blob/master/libxslt/variables.c#L1581
I think it works because xsltProcessUserParamInternal only sets
xpctxt->namespaces = NULL but it doesn't clear xpctxt->nsHash which is where
xmlXPathRegisterNs puts the namespaces to be registered.
But the _expression_ is compiled before resetting the namespaces, so I guess
that's why.
> I would have thought this would have been done automatically though. Did I
> miss something or is there a better way to do this?
No, I'd recommend that you only use string and integer params.
Can you give me a hint? I've had absolutely no luck is trying to pass a path
as a string and getting it to result in something other than "The 'select' _expression_
did not evaluate to a node set" even in an absurdly simple example. I'm passing
the path double quoted "'/dm:device'" and have tried various combinations of
"select=" and "with-param". Even Google is failing me so any help would be appreciated.
Thanks!
Nick
