Re: [xslt] xsltRegisterExtFunction vs xsltRegisterExtModuleFunction?

[Daniel Veillard <veillard redhat com>]

On Thu, Feb 14, 2008 at 02:59:19PM +0000, Tony Graham wrote:
> xsltRegisterExtFunction [1] and xsltRegisterExtModuleFunction [2] both
> register extension functions (and there are similarly two variants for
> registering extension elements).
> 
> xsltRegisterExtFunction is used in the example in the libxslt
> documentation [3] and xsltRegisterExtModuleFunction is used in the
> xsltRegisterTestModule() test function [2] that is part of libxslt's
> tests.
> 
> Both variants work.  Is there any guidance on which is preferable when?

  Well it's very different, xsltRegisterExtModuleFunction is supposed
to be called from extension modules and will affect all 
transformations which may use that module (i think the binding is done
using the namespace), that registration will be done at initialization
time when the module is defined and usable later when stylesheets using the
module are compiled. 
  xsltRegisterExtFunction on the other hand do the binding only in the
transformation context given as parameter, this is a runtime extension
and affects only the currently running transformation.

  So different is mostly scope of use, and how the binding is done.

Daniel

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