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In opposite to standard YANG's "use" and "augment" the schema mount mechanism allows the model modification at runtime. 
While parent (extendable) module require to define the mount point(s) any already defined (legacy) module (including standard)
can be used as a mounted model.

The ietf-yang-schema-mount module defined in RFC-8528 defines structures for following entities:

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Below is example of simple mount-point definition within a YANG module

module test-mount {
    yang-version 1.1;
    namespace "org:onap:cps:test-mount";
    prefix tmount;
    revision "2020-02-02";

    import ietf-yang-schema-mount {
         prefix yangmnt;
    }

    container root-element {
        yangmnt:mount-point "root-mp";
	}
}

...

{ 
  "ietf-yang-library:yang-library": {
     "content-id": "14e2ab5dc325f6d86f743e8d3ade233f1a61a899some-id",
     "module-set": [
        {
          "name": "module-set",
          "module": [
              {
                "name": "mounted-module",
                "revision": "2020-02-02",
                "namespace": "urn:org:onap:cps:test:mounted-module"
              }
              // other modules 
           ]
         }
      ]
   }
}

So the data on model dependencies will be as shown on diagram

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