Currently standards based devicemanagers exist in SDNR and when a mountpoint is added, the right devicemanager is identified based on the standard YANG model supported by that mountpoint. However, when devices have custom YANG models in addition to the standard YANG models or different implementations of NETCONF like - configuration information present in different data stores - this requires for more than one way of identifying the right devicemanager when a mountpoint is added. 

The core devicemanager should be enhanced to support such a functionality.