[NTG-context] reference points with double colons (::) are not working

Hello, I have double colons (::) in my reference points. (It's actually the same string I also use to refer to my publication database) But they wont show up as you can see in the example below. Is there any way to fix this? Thanks for your help and best regards Michael ----- \starttext \placefigure[here][img:cow]{This is a cow}{\externalfigure[cow.jpg]}\par \placefigure[here][img::mill]{This is a mill}{\externalfigure[mill.png]}\par The picture in \in{Figure}[img:cow] is a cow\par The picture in \in{Figure}[img::mill] is a mill (cross reference is not working)\par \stoptext -----