lang() function and ISO 639

Subject: lang() function and ISO 639
From: John Robert Gardner <jrgardn@xxxxxxxxx>
Date: Thu, 8 Jun 2000 17:44:21 -0400 (EDT)
I was looking over the lang() function in XPath under the boolean core
function group (spec. 4.3) and wondered if there was a problem between the
2-letter ISO 639 spec, and the  ISO 639-2:1998 which sets three-letter
codes (  I
checked Kay's book, and he notes on p. 474 that ". . . if the context node
is the element <para xml:lang="fr-CA"> (indicating Canadian French), then
the expression "lang('fr')" would return true."  Some of the 3-letter
characters--I was once told--in  ISO 639-2:1998 are not similar to allow a
match with just two characters as the spec seems to call for.  I will
double check for incompatible languages, b/c I confess I'm asking this
partly on heresay. 

The xml:lang attribute that is checked by lang() must be declared as such,
just as the case with xml:space, correct?  The QName does not need a
separarte namespace declaration b/c xml: is a default namespace for xml
instances, right?  I'd only need to add that attribute, by my
understanding, yes?


John Robert Gardner, Ph.D.
XML Engineer
Emory University
"There is a difference between knowing The Path, and walking the Path."
					-Lawrence Fishburn/Morpheus

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