19. The system of claim 18 , further comprising means for extending a constraint language for constraint clustering, wherein constraints for the constraint clustering are defined in a form of must-link or cannot-link pairs.
19. The system of claim 18 , further comprising means for extending a constraint language for constraint clustering, wherein constraints for the constraint clustering are defined in a form of must-link or cannot-link pairs. 20. The system of claim 19 further comprising means for extending the constraint language so that the constraints are assigned confidence scores.