Hi, I have got round to start editing the short service discovery document again. During one of the OGF seesions I suggested that to avoid clashes between the two sets of attributes in a service_description we could introduce 2 container objects both of which would implement the attribute interface. This would lead to code, where s is a service\_description: s.get_glue().get_attribute("some predefined 'glue' attribute") s.get_data().get_attribute("some key value in the key value pair") This was more or less agreed by those present. However I would now like to suggest a small change: s.get_attribute("some predefined 'glue' attribute") s.get_data().get_attribute("some key value in the key value pair") This requires only one new container object and I think more faithfully represents the model. I will start editing in this direction tomorrow unless I hear objections. Steve