The workflows described in 4.3 define interactions between OPC UA Applications. Implementing these workflows requires an OPC UA Information Model. This section builds on existing Information Models and defines the additional types and instances needed to completely implement the workflows. Clause 9.2 defines the Information Model implemented in a Registrar that provides support for PullManagement defined in 7.2. Clause 9.3 defines the Information Model implemented in a DCA Server that provides support for PushManagement defined in 7.3.