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There is a special resource class not shown in the class diagram above, that is specification. The classes of w an shown above are abstract, we could use them to describe any wan scenario with specify specification which has the specify parameters for the scenario. For example, we could use overlay vpn specification an FC to describe overlay vpn. All specify specification classes are derived from specification base class which is shown as below diagram:
The specify specification class will be consumed by specify Direct Graph in SDN-C. As we could import specification class in SDC and import DG in SDN-C dynamically, new wan scenario could be taught to ONAP after version release.
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