April 11 '06

Subject: IPC-5: Last Test Domain and Fixed Bug in Storage GroundedPreferences

Dear IPC-5 competitor,

The LAST test domain is now available! This is an extension of the
"Pipesworld" domain that was used in the previous competition. 
The extension concerns two new variants of the domain involving some 
of the new features of PDDL3.0. A short informal description of the 
domain is attached.

We have fixed a bug in storage/SimplePreferences/GroundedPreferences 
that Chih-Wei Hsu (SGPlan team) has recently pointed out. In problems 
p01-p04 (now fixed), the plan metrics includes some undefined preferences. 
This happened because the software we used for the automatic grounding 
of the preferences removes the preferences that are trivially satisfied 
by any plan from the problem file (but leaves them in the plan metric). 
An immediate solution would be to just ignore the preferences that are
mentioned in the plan metric, but that are not defined in the problem
file. If your planner does so, then there is no need to re-run it with 
the problems above.

We believe that these are the only problems with undefined preferences,
but if you find any other problem like this one in another grounded
domain-problem, please let us know as soon as possible.

Finally, please keep in mind that MAY 1 IS THE HARD DEADLINE for
completing your tests and sending an executable of your planner!

Thanks.
Regards, Alfonso