Does someone know what is the different between those code lists?

[Martin Desruisseaux]

Hello Frédéric

Sorry to bother you again, I'm still trying to put some order in our 
(un)marshalling of locales and code lists.

The http://schemas.opengis.net/iso/19139/20070417/resources/Codelist/ 
directory contains three files:

 * ML_gmxCodelists.xml
 * gmxCodelists.xml
 * tcCodelists.xml


Do you know what is the difference between those files, in particular 
between "gmlCodelists.xml" with and without "ML_" prefix? Both of them 
seem to contain ISO 19115 code lists, and it is not clear to me how we 
are supposed to know which one to reference.

    Thanks!

        Martin