http://www.rfc-editor.org/rfc/rfc3318.txt
RFC 3318: Framework Policy Information Base, R. Sahita, S. Hahn, K. Chan, K. McCloghrie2003-03-01T23:00:00-00:00As described in COPS usage for Policy Provisioning (COPS-PR), each client supports a non-overlapping and independent set of PIB modules. However, some PRovisioning Classes are common to all subject-categories (client-types) and need to be present in each.