2008/8/13 Michael Kay <mike(_at_)saxonica(_dot_)com>:
Given two stylesheets with the same namespaces defined at the
top where one imports the other - what happens when the
module is compiled?
Entirely implementation-defined.
In Saxon, any instruction/expression that needs access to the namespace
context at run-time will (at compile time) make a copy of the namespace
context and save it on the expression tree. It's true that there is
therefore a slight overhead in having unused namespaces present in the
stylesheet - but I doubt it is measurable.
I can't quite see how import comes into this, however.
I thought that for an import/include tree of stylesheets that
conflicting prefixes/URIs would have to be combined in some way... but
they only apply to the file they are in don't they... (a bit of an
a-ha moment for me here)
I forget that namespaces work at the XML file level - you can't just
define your namespaces somewhere in your import tree and expect them
to be available to the stylesheets in that tree (like variables and
named templates for example)
--
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/
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