[xml] xml:lang iso639-2 / rfc3066 / rfc 1766 obsolete

["Friedbert Wekerle" <wekerle gmx de>]

Dear wizzards of libxml,

I'm missing the support of

'xml:lang="grc"'

(Old greek)

in libxml; 

I'm using version libxml2-2.6.30;

For example, the the xerces-Parser accepts 3-letter language-Codes as valid ones.

I found, rfc 3066 obsoletes rfc 1766 
(http://www.faqs.org/rfcs/rfc3066.html)

Have I got a possibility of adding 
other languagecodes as valid ones,
especially "grc" or removing the validation
against the builtin enumeration of languagecodes?
(without changing the data)

Any other hint?

Sincerly
Friedbert
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