<additionalName>@xml:lang mandatory? (de: Sprachbezeichnung für zusätzliche Namen verpflichtend?)

The question has been raised: If an additional name is given (element ), it should always include the information about the used language (attribute @xml:lang).

Therefore:

• declare the parameter as "should" with railML 2.3
• set the parameter mandatory with the next major release railML 3

--> see http://trac.railml.org/ticket/96 too!