This stuff is in English although my native language is German. This is an explanation why. It goes along the roads of ELFE but concentrates on my personal view. It would be obviously pointless to write this in English as well, so I'm switching to German here.
N. Fuchs. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), volume 3596 of Lecture Notes in Computer Science, page 51-51. Springer, (2005)