module bar {
    namespace bar;
    prefix bar;
    yang-version 1.1;

    revision 2017-01-20;

    leaf my-leaf {
        type int32;
        units seconds;
        default 100;
        bar:custom-property-without-arg;
    }

    leaf-list my-leaf-list {
        type string;
        default "def-val-1";
        default "def-val-2";
        must "a = 1 or b = 2";
        must "x != y";
    }

    list my-list {
        key key-leaf;

        unique "my-leaf-a my-leaf-b";
        unique "my-leaf-c my-leaf-d";
        bar:custom-property "arg";
        bar:custom-property "another arg";

        leaf key-leaf {
            type string;
        }

        leaf my-leaf-a {
            type string;
        }

        leaf my-leaf-b {
            type string;
        }

        leaf my-leaf-c {
            type string;
        }

        leaf my-leaf-d {
            type string;
        }
    }

    container my-cont {
        uses my-grouping {
            refine my-used-leaf {
                default "def-val-added-by-refine";
                bar:custom-property-without-arg;
            }
        }
    }

    augment "/my-cont" {
        leaf my-aug-leaf {
            type int32;
            default "def-val";
            units "minutes";
            must "x = 1";
            bar:custom-property-without-arg;
        }
    }

    grouping my-grouping {
        leaf my-used-leaf {
            type int32;
            units "days";
            must "y = 5";
        }
    }

    extension custom-property {
        argument name;
    }

    extension custom-property-without-arg;
}