1. A method comprising: providing an ontology that represents a hierarchical organization of a plurality of nodes, wherein each node of the plurality of nodes corresponds to one class of a plurality of classes; associating each peer system of a plurality of peer systems with at least one of the plurality of nodes in the ontology based on information maintained on each peer system and a class of the plurality of classes to which the information corresponds; receiving a request including a select class of the plurality of classes from a first peer system of the plurality of peer systems; identifying a select node of the plurality of nodes based on the select class; identifying at least one peer system of the plurality of peer systems that is associated with the select node; and sending to the first peer system identification information identifying the at least one peer system and identifying a date and a time of when the at least one peer system was associated with the ontology.