Managing inter-object dependencies in object-oriented systems is a complex task. Changes of one object often require dependent objects to change accordingly. Making every object explicitly inform every dependent object about its state changes intertwines object interfaces and implementations, thereby hampering system evolution and maintenance. These problems can be overcome by introducing the n...

data types, polymorphism, control structures. General Terms: Design, Languages Additional

Batch services are a new approach to distributed computation in which clients send batches of operations for execution on a server and receive hierarchical results sets in response. In this paper we show how batch services provide a simple and powerful interface to relational databases, with support for arbitrary nested queries and bulk updates. One important property of the system is that a si...

Any gantral model-based vision system must somehow se­ lect a few serious candidates from its model base before ap­ plying model-directed processing. This is necessary for both efficiency and recognising 'similar* models (i.e. handling data errors, generic models and previously unseen objects). This pa­ per shows how one can Integrate knowledge of object properties, structural and generic relat...