The file in this repo, xmlpg/DIS2012.xml and the one over in DISDescription/DIS7.xml differ slightly. They should be the same.
https://github.com/open-dis/xmlpg/blob/master/DIS2012.xml
https://github.com/open-dis/DISDescription/blob/master/DIS7.xml
It looks to me like different fixes have gone into both so a careful merge of the two should be considered.