Hi, I had troubles with the query visitor which was always returning empty results. After some investigation, I found out that MAAccessorRelation>>isSatifisfiedBy: was failing but the error was eaten by #hasMatch. MAAccessorRelation>>isSatisfiedBy: contains two typos: - #descripition is misspelled - #read: doesn't exist. I fixed the method and it looks like this: MAAccessorRelation>>isSatisfiedBy: anObject | description | description := anObject description detect: [ :each | self accessor = each accessor ] ifNone: [ ^ false ]. ^ super isSatisfiedBy: (anObject readUsing: description). Now the visitor works very nicely. I have one question about the test case of the query visitor. Some tests call a #matches: method that doesn't exist. I have tried to use the methods of the String class but they are all rejected. How does it work? -- Dominique