Annotations that represent MMDB comments have URI's like this:

"tag:cet.ncsa.uiuc.edu,2008:/bean/Annotation/[C@12f"

this appears to be using the default implementation of java.lang.Object.toString instead of a global ID minting strategy like GUID or Tupelo's SecureHashMinter, so the collision probability is high.

This looks like an easily-fixed issue with the relevant bean util, so I'm tentatively assigning it to Rob.