This section describes some attributes that are used in many different places.
This attribute defines the language used in an element.
In general, codes can have one of two forms:
xml:lang=", where LL" is a language code. These
codes are defined by ISO 639.
LL
xml:lang=" where
LL-CC" is a
language code and LL is a country code.
Country codes are defined by ISO 3166-1993 .
CC
For example, use xml:lang='en' for English;
use xml:lang='en-us' for United
States English.