module crypto-base {

    yang-version 1;

    namespace "ydt.crypto-base";

    prefix "crypto";

    organization "ON-LAB";

    description "This module defines for crypto-base classifier.";

    revision "2016-05-24" {
        description "Initial revision.";
    }

    identity crypto-alg {
    description
        "Base identity from which all crypto algorithms
        are derived.";
    }

    identity crypto-alg2 {
       base crypto-alg;
    }

    identity crypto-alg3 {
       base crypto-alg2;
    }

    leaf crypto {
        type identityref {
            base "crypto-alg";
        }
    }

    typedef abc {
       type identityref {
                   base "crypto-alg";
               }
    }

    leaf-list abc-type {
        type abc;
    }

    leaf abc-zeunion {
        type union {
             type identityref {
                               base "crypto-alg";
                           }
        type abc;
        }
    }

    leaf level2 {
       type identityref {
                          base "crypto-alg2";
                      }
    }

    leaf level3 {
       type identityref {
                          base "crypto-alg3";
                      }
    }

    leaf level4 {
        type union {
             type identityref {
                               base "crypto-alg3";
                           }
        type abc;
        }
    }
}