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. 15. The system of claim 13 , wherein the component that pulls the current values for the identified one or more attribute instances requests an attribute value from the source of attribute values in response to receipt of a unique request identification (ID) for the attribute value request; and wherein the component that pulls the current values for the identified one or more attribute instances receives at least one of an attribute value or an error message in response to requesting an attribute value.