<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!