On Tue, Mar 1, 2022 at 3:37 AM Nick Wellnhofer wrote:
> On 28/02/2022 22:07, George Joseph wrote:
> > Actually "//*[name()='dm:device']" works as well so maybe that's what
> I'll do.
>
> This seems like the best work-around.
>
Yeah makes sense. I'll need to do some performance testing regardless
of which way I go since I'm parsing SIP messages in real time.
> > Is there any reason why path parameters with namespaces haven't been
> > supported?
> > Would a pull request to add the namespaces
> in xsltNewTransformContext be
> > considered?
>
> How parameters are passed isn't covered by the standard, so it's up to the
> implementation to come up with something. It seems natural to allow XPath
> expressions, but it's not clear how to handle namespaces. Simply taking
> the
> namespace defitinions from the root element of the root stylesheet should
> do
> what most people expect, but it is somewhat fragile.
>
>
True.
> 1. Passing parameters from the command line
>
> Supporting namespaces in a clean way would probably require a separate
> channel
> to register namespaces just for parameter evaluation. Even Saxon doesn't
> seem
> to support custom namespaces in parameter expressions:
>
> "The static context for this XPath expression includes only the standard
> namespaces conventionally bound to the prefixes xs, fn, xsi, and saxon."
> [1]
>
> 2. Passing parameters using the API
>
> The most flexible approach is probably an API to set parameters directly,
> similar to Saxon's XsltTransformer [2]. This would even allow to pass
> nodes
> from external documents as parameters. But if you want to combine that
> with
> XPath expressions, you'd have to evaluate them yourself.
>
> Nick
>
>
Gotcha. Thanks for all your help Nick!
>
> [1]
> https://www.saxonica.com/documentation11/index.html#!using-xsl/commandline
> [2]
>
> https://www.saxonica.com/documentation11/index.html#!javadoc/net.sf.saxon.s9api/XsltTransformer@setParameter
>
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