[Pharo-project] What does HODataBase do?

So, because I'm perverse like that, and because it's there, I grabbed Damian's latest dev-image and ran the Code Critics against everything in the image. Once the bottom of my macbook had returned to a bearable temperature, I started going through the results and found scads of references to the "undeclared variable" HODataBase and other HO* names, mostly in the OBEnriched family of classes. Does anyone have any idea what's going on?