That is funny Paul. Did you notice the large nipples on one of the terminals? That is the anode (+).
To confirm, I looked at the PDF file and the dimensions drawing. There you will see mention that "Tantalum wire
nib identifies anode (+) terminal".
But then again, one cannot be careful enough when dealing with tantalum caps! Install them in backwards and they explode!
EDIT: just to clarify the statement I made about you being funny, that was related to you saying that you couldn't tell the difference between the leads. To me it was like night and day. But I know this is a surface mounted device which has no leads - only solder terminals on each end (where one end is plain and the other end has very visible nipples). I suspect that you might have thought that those 2 nipples were the cap's terminals. But since then are both electrically connected by the metallic coating, they bot are the same terminal (positive).