[xslt] xsltRegisterExtFunction vs xsltRegisterExtModuleFunction?

[Tony Graham <Tony Graham MenteithConsulting com>]

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?

Regards,


Tony Graham.
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[1] http://www.xmlsoft.org/XSLT/html/libxslt-extensions.html#xsltRegisterExtFunction
[2] http://www.xmlsoft.org/XSLT/html/libxslt-extensions.html#xsltRegisterExtModuleFunction
[3] http://www.xmlsoft.org/XSLT/extensions.html#Registerin1
[4] http://svn.gnome.org/viewvc/libxslt/trunk/libxslt/extensions.c?view=markup