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The augmentation is mainly used to extends an existing model. The augmentation is encapsulated within separate
module file, having own namespace and revision. Example:

module base {
    yang-version 1.1;

    namespace "org:onap:cps:test:base";
    revision "2020-01-01";
    prefix "base";

    container base-container {
        leaf name {
            type string;
        }
        leaf description {
            type string;
        }
    }
}

module augment {
    yang-version 1.1;

    namespace "org:onap:cps:test:augment";
    revision "2020-01-02";
    prefix "augment";

    import base {
        prefix "base";
    }

    grouping augment-group {
         leaf augmented-leaf {
             type string;
         }
    }

    augment "base:base-container" {
        uses augment-group;
    }
}

{
  "base-container": {
    "name": "test name",
    "description": "test description",
    "augmented-leaf": "more information"
  }
}

Empty module issue

When files are processed the effective model is referenced by name, namespace and revision of a base file, which remain same.
At the same time the augment module became extra, because it contains no model so it won't be ever referenced (directly) for data validation.

Imports

The imports are mainly used to re-use definitions from existing modules.

module base {
    yang-version 1.1;

    namespace "org:onap:cps:test:importer";
    revision "2020-02-01";
    prefix "importer";

    import exporter {
        prefix "exporter";
    }

    container importer-container {
        leaf name {
            type string;
        }
        leaf description {
            type string;
        }
        uses "exporter:export-group";
    }
}

module exporter {
    yang-version 1.1;

    namespace "org:onap:cps:test:exporter";
    revision "2020-02-02";
    prefix "exporter";

    grouping export-group {
         leaf exporter-leaf {
             type string;
         }
    }

    container exporter-container {
        uses export-group;
    }
}

{
  "importer-container": {
    "name": "test name",
    "description": "test description",
    "exporter-leaf": "test imported"
  }
}

{
  "exporter-container": {
    "exporter-leaf": "test data"
  }
}

Multiple valid models issue

When the data is being decomposed using a schema context built from these two yang files, there will be no any error
if the incoming JSON matches any of models within . The appropriate module (for validation/parsing) could be chosen
dynamically. It also possible there could be collision if root container elements of both modules are having same name.

Submodules

Module vs Yang File