import org.simantics.acorn.exception.IllegalAcornStateException;
import org.simantics.db.Database.Session.ResourceSegment;
import org.simantics.utils.datastructures.Pair;
import org.simantics.acorn.exception.IllegalAcornStateException;
import org.simantics.db.Database.Session.ResourceSegment;
import org.simantics.utils.datastructures.Pair;