add MeContext; the file is the same in R17,18,19

module _3gpp-common-mecontext {

  yang-version 1.1;

  namespace "urn:3gpp:sa5:_3gpp-common-mecontext";

  prefix "mectx3gpp";

  import _3gpp-common-yang-types { prefix types3gpp; }

  import _3gpp-common-top { prefix top3gpp; }

  import _3gpp-common-subnetwork { prefix subnet3gpp; }

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

  organization "3GPP SA5";

  contact "https://www.3gpp.org/DynaReport/TSG-WG--S5--officials.htm?Itemid=464";

  description "Defines basic MeContext which will be augmented by other IOCs

    Copyright 2024, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI,

    TTA, TTC). All rights reserved.";

  reference "3GPP TS 28.623

    Generic Network Resource Model (NRM)

    Integration Reference Point (IRP);

    Solution Set (SS) definitions

    3GPP TS 28.622

    Generic Network Resource Model (NRM)

    Integration Reference Point (IRP);

    Information Service (IS)";

  revision 2024-07-17 { reference "CR-0381 CR-0382 CR-0383"; }

  grouping MeContextGrp {

    description "Represents the MeContext IOC.";

    leaf dnPrefix {

      type types3gpp:DistinguishedName;

      description "It carries the DN Prefix information or no information.

        The instance of MeContext is the local root instance of the MIB.

        Otherwise the attribute shall be absent or carry no information.";

      reference "Annex C of 32.300 ";

    }

  }

  augment "/subnet3gpp:SubNetwork" {

    list Mecontext {

      description "This IOC is introduced for naming purposes. It may support

        creation of unique DNs in scenarios when some MEs have the same RDNs due

        to the fact that they have been manufacturer pre-configured.

        If some MEs have the same RDNs (for the above mentioned reason) and they

        are contained in the same SubNetwork instance, some measure shall be

        taken in order to assure the global uniqueness of DNs for all IOC

        instances under those MEs. One way could be to set different dnPrefix

        for those NEs, but that would require either that:

        a)  all LDNs or DNs are locally modified using the new dnPrefix for the

        upper portion of the DNs, or

        b)  a mapping (translation) of the old LDNs or DNs to the new DNs every

        time they are used externally, e.g. in alarm notifications.

        As both the two alternatives above may involve unacceptable drawbacks

        (as the old RDNs for the MEs then would have to be changed or mapped to

        new values), using MeContext offers a new alternative to resolve the DN

        creation. Using MeContext as part of the naming tree (and thus the DN)

        means that the dnPrefix, including a unique MeContext for each ME, may

        be directly concatenated with the LDNs, without any need to change or

        map the existing ME RDNs to new values.

        MeContext have 0..N instances. It may exist even if no SubNetwork exists.

        Every instance of MeContext contains exactly one ManagedElement during

        steady-state operations.";

      key id;

      uses top3gpp:Top_Grp;

      container attributes {

        uses MeContextGrp;

      }

      yangmnt:mount-point children-of-MeContext {

        description "Mountpoint for ManagedElement";

        reference "RFC8528 YANG Schema Mount";

      }

    }

  }

}

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