Re: namespace prefixes in XSLT parameters

>From what I understand of the dark art of namespaces, this makes a certain 
amount of sense - the spreadsheet should function identically to the 
outside whether it internally represents "http://example.com/ltx":section 
as ltx:section or as l:section. Namespace prefixes are, for the purpose of 
the stylesheet, local variables. 

This means that you should not be able to rely on namespace prefixes 
declared inside the stylesheet, that would violate encapsulation. 
(although are doesn't passing an xpath query to be evaluated also count as 
violating encapsulation?)

I would create a function that turns your xpath expression with namespace 
prefixes into one with fully qualified namespaces. It'd be pretty simple 
to put one together with regexes, but there would be edge cases like 
text()[.="ltx:section"], although these may be so unlikely you might not 
mind. LibXML also might have some tools for doing this, but I'm not sure 
what.

Daniel



From:   Bruce R Miller <[email protected]>
To:     "[email protected]" 
<[email protected]>
Date:   19/09/2012 00:10
Subject:        namespace prefixes in XSLT parameters
Sent by:        [email protected]



Hi all;
  When you pass a parameter to an xslt, for me
the common issue was always to quote it enough,
since the value is actually an XPath expression:
   $stylesheet->transform($document,PARAM=>"'some text'");

I thought I'd get fancy and try using the XPath
functionality.  I guess it's clear that the XPath
will be _evaluated_ inside the stylesheet, and
with the document loaded --- otherwise, it wouldn't
be much use, right?

For example:
 
$stylesheet->transform($document,PARAM=>"//ltx:section/ltx:title/text()");

What I hadn't anticipated is that it seems to
get _compiled_ before or outside that context.
In particular, it doesn't know the namespace prefixes
that have been established by the stylesheet
(nor by the document!)

And there seems to be no methods to register such
associations.  Googling turns up an ancient
email that establishes that XPathContext and LibXSLT
are entirely disconnected....

Is there a way to use namespace prefixes?

Thanks;
bruce
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