13. The system of claim 12 , comprising: a component that identifies one or more attribute instances that match one or more criteria that are specified by an attribute value request; a component that pulls current values for the identified one or more attribute instances from a source of attribute values; a component that determines if an attribute value is received and that processes the attribute value when received; and a component that determines whether multiple attribute values are available for the attribute instances that match the one or more criteria and that mediates the multiple values when available.
13. The system of claim 12 , comprising: a component that identifies one or more attribute instances that match one or more criteria that are specified by an attribute value request; a component that pulls current values for the identified one or more attribute instances from a source of attribute values; a component that determines if an attribute value is received and that processes the attribute value when received; and a component that determines whether multiple attribute values are available for the attribute instances that match the one or more criteria and that mediates the multiple values when available. 14. The system of claim 13 , comprising: a component that delivers previously received and stored attribute values that match the one or more criteria.