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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

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 testroot-mount-rootelement {
        yangmnt:mount-point "root-mp";
	}
}

schema-mounts

While mount-point is a part of YANG definition the schema-mounts definition is delivered as data and it's expected
the server is capable to recognize this data as a model configuration update (modification).

The schema-mounts data describes which module to be attached to which mount-point (uniquely identified by
extended module name and mount point label). The reference to mount point is (expected to be) unique combination 
of module name and a label assigned to mount point. The reference to mounted model could be various (described below).

Below is example of schema-mount data set referencing model to be taken from a library:

{
  "ietf-yang-schema-mount:schema-mounts": {
    "mount-point": [{
        "module": "test-mount",
        "label": "root-mp",
        "shared-schema": {}
       }]
  }
}

Mounted model can be addressed the one of the following ways:

Known library item

Using shared-schema empty body (as in example above) indicates the model will be referenced by data while
it's expected (assumed) the model definition (YANG) to be taken from a server library identified earlier. 

So if the data looks like below (addresses test-mount module described above):

{
  "test-mount:root-element": { 
    "root-mp": { // mount point
        "mounted-module:mounted-container": { // mounted module reference
			// data associated to mounted module
		}
    }
  }
}

it assumes there is a module with name "mounted-module" (known by the server) having root level container 
named "mounted-container". 

In order to address a mounted module as belonging to shared "shared-schema" the server needs a configuration
instruction as described RFC-8525, the yang-library message to be like below

{ 
  "ietf-yang-library:yang-library": {
     "content-id": "14e2ab5dc325f6d86f743e8d3ade233f1a61a899",
     "module-set": [
        {
          "name": "module-set",
          "module": [
              {
                "name": "mounted-module",
                "revision": "2020-02-02",
                "namespace": "urn:org:onap:cps:test:mounted-module"
              },                                   // other modules                          ]                  }          }}

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