How to language tag language tags?

If I wanted to create a HTML version of the language subtag registry, 
then I would tag the entire registry with lang="en" (<html lang="en">), 
while each entr in the registry perhaps could look like this:

<p>Type: language<br/>
   Subtag: <dfn lang="zxx">aa</dfn><br/>
   Description: Afar<br/>
   Added: 2005-10-16</p>

Question: Do you agree with the choice of language tag for the <dfn> 
element around the very language tag? 

The chose 'zxx' ('No linguistic content') is based on 
which lists "machine-readable data files consisting of machine 
languages or character codes, programming source code, etc" as example 
of things which could use this tag.

Leif H Silli

Received on Thursday, 5 January 2012 11:07:46 UTC