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This document describes a YANG data model to describe the topologies of an Optical Transport Network (OTN).  It is independent of control plane protocols and captures topological and resource-related information pertaining to OTN. This model enables clients, which interact with a transport domain controller, for OTN topology-related operations such as obtaining the relevant topology resource information. The document is clearly written and meets its scope.It is useful for operators that deploy and manage this type of networks.