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Object Oriented deep graph models, pojos specifically, cannot be easily reasoned over declaratively - which can create a reliance on imperative programming. With the work that W3C has done to standardise Description Logic with OWL-DL combined with declarative reasoning sytems like Drools (we'll be adding Description Logic based modelling after 4.0) you have a much more powerful metaphor for application development (although probably not framework/subs system development)