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Re: Is exclude-result-prefixes wise in XHTML-to-XHTML

Subject: Re: Is exclude-result-prefixes wise in XHTML-to-XHTML transformations?
From: David Carlisle <davidc@xxxxxxxxx>
Date: Thu, 11 Mar 2004 15:17:43 GMT
exclude result prefixes all
  So that reads to me like exclude-result-prefixes will
  work for an XSL transform that copies nodes in the
  XHTML namespace from input to output, but might
  monkey-wrench a transform of nodes in the null
  namespace to nodes in the XHTML namespace. Is that
  correct?

No, exclude-result-prefixes never gives the system licence to change the
namespace of an element or attribute. It only stops namespace nodes
being copied to the result tree because they happen to be in scope from
somewher higher in the stylesheet. Any element that's in a namespace (or
in no namespace) so all elements and attributes will _always_ have
whatever namespace nodes needed to correctly interpret the name.
Such namespace nodes may produce namespace declarations in the
serialisation irrespective of whether that namespace is specified with
exclude result prefixes.

The XSLT 1 situation is that with a bit of care you have absolute
control over what namespace nodes are in the result tree.
so for example if you want a namespace node mapping
"" (default namespace) to http://www.w3.org/1999/xhtml (XHTML)
and
"m" to  http://www.w3.org/1998/Math/MathML (MathML) then you can do
that.

then the tree has elements in the xhtml or mathml namespaces 
and a system can choose _any_ prefix it wants for those namespaces and
add suitable namespace declarations, however since it must have added
namespace declarations
xmlns="http://www.w3.org/1999/xhtml"
xmlns:m="http://www.w3.org/1998/Math/MathML"
already, it would be peverse of the system not to use those prefixes.

In my experience most systems do use the prefixes specified in namespace
nodes in the result tree. I've had to try quite hard to get any system
to make up prefixes on the fly (the easiest way to force this is to copy
several attributes with the same prefix but different namespaces in to an
element, it has to rename all but one of the attributes to use new
prefixes on serialisation)


David



-- 
http://www.dcarlisle.demon.co.uk/matthew

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