Could you give me an example of a reference problem ? so  so l I can make it more concrete ?
Well   How do I get to the Powder - Tower ? We sort of t think that our bit in this problem is interesting , but , just to get from Powder - Tower to an object I ID in a database is also not really trivial.
Or  or if you take something even more scary , um , " how do I get to the third building after the Tower ? the Ple - Powder - Tower ? "
Mmm.