etsi-nfv-vnf.yang

          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc information
           element";
      }

      leaf name {
        mandatory true;
        type string;
        description
          "The name of this software image.";
        reference
          "GS NFV IFA011: Section 7.1.6.5 SwImageDesc
           information element.";
      }

      leaf version {
        mandatory true;
        type string;
        description
          "The version of this software image.";
        reference
          "GS NFV IFA011: Section 7.1.6.5 SwImageDesc
           information element.";
      }

      leaf provider {
        type string;
        description
          "The provider of this software image. If not present the
           provider of the software image is assumed to be same as
           the VNF provider.";
        reference
          "GS NFV IFA011: Section 7.1.6.5 SwImageDesc
           information element.";
      }

      container checksum {

        leaf algorithm {
          mandatory true;
          type identityref {
            base checksum-algorithm;
          }
          description
            "Species the algorithm used to obtain the checksum
             value.";
          reference
            "GS NFV IFA011: Section 7.1.6.10 ChecksumData
             information element.";
        }

        leaf hash {
          mandatory true;
          type string;
          description
            "Contains the result of applying the algorithm
             indicated by the algorithm attribute to the data to
             which this ChecksumData refers.";
          reference
            "GS NFV IFA011: Section 7.1.6.10 ChecksumData
             information element.";
        }
        description
          "The checksum of the software image file.";
        reference
          "GS NFV IFA011: Section 7.1.6.5 SwImageDesc
           information element.";
      }

      leaf container-format {
        default "bare";
        type enumeration {
          enum "aki" {
            description
              "An Amazon kernel image.";
          }
          enum "ami" {
            description
              "An Amazon machine image.";
          }
          enum "ari" {
            description
              "An Amazon ramdisk image.";
          }
          enum "bare" {
            description
              "The image does not have a container or metadata
               envelope.";
          }
          enum "docker" {
            description
              "A docker container format.";
          }
          enum "ova" {
            description
              "An OVF package in a tarfile.";
          }
          enum "ovf" {
            description
              "The OVF container format.";
          }
        }
        description
          "The container format describes the container file
           format in which software image is provided.";
        reference
          "GS NFV IFA011: Section 7.1.6.5 SwImageDesc
           information element.";
      }

      leaf disk-format {
        default "qcow2";
        type enumeration {
          enum "aki" {
            description
              "An Amazon kernel image.";
          }
          enum "ami" {
            description
              "An Amazon machine image.";
          }
          enum "ari" {
            description
              "An Amazon ramdisk image.";
          }
          enum "iso" {
            description
              "An archive format for the data contents of an
               disk, such as CD-ROM.";
          }
          enum "qcow2" {
            description
              "Supported by the QEMU emulator that can expand
               dynamically and supports Copy on Write.";
          }
          enum "raw" {
            description
              "An unstructured disk image format; if you have a
               file without an extension it is possibly a raw
               format.";
          }
          enum "vdi" {
            description
              "Supported by VirtualBox virtual machine monitor
               and the QEMU emulator.";
          }
          enum "vhd" {
            description
              "The VHD disk format, a common disk format used by
               virtual machine monitors from VMware, Xen,
               Microsoft, VirtualBox, and others.";
          }
          enum "vhdx" {
            description
              "The VHDX disk format, an enhanced version of the
               VHD format, which supports larger disk sizes among
               other features.";
          }
          enum "vmdk" {
            description
              "Common disk format supported by many common virtual
               machine monitors.";
          }
        }
        description
          "The disk format of a software image is the format of
           the underlying disk image.";
      }

        leaf min-disk {
          type uint64;
          units "GB";
          mandatory true;
          description
            "The minimal disk size requirement for this software
             image. The value of the 'size of storage' attribute
             of the VirtualStorageDesc referencing this
             SwImageDesc shall not be smaller than the value of
             minDisk.";
          reference
            "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
             information element.";
        }

      leaf min-ram {
        type decimal64 {
          fraction-digits 1;
          range "0..max";
        }
        units "GB";
        default 0;
        description
          "The minimal RAM requirement for this software image.
           The value of the 'size' attribute of
           VirtualMemoryData of the Vdu referencing this
           SwImageDesc shall not be smaller than the value of
           minRam.";
        reference
          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
           information element.";
      }

      leaf size {
        mandatory true;
        type uint64;
        units "GB";
        description
          "The size of this software image.";
        reference
          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
           information element.";
      }

      leaf image {
        default ".";
        type inet:uri;
        description
          "This is a reference to the actual software image.
           The reference can be relative to the root of the VNF
           Package or can be a URL";
        reference
          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
           information element.";
      }

      leaf operating-system {
        type string;
        description
          "Identifies the operating system used in the software
           image. This attribute may also identify if a 32 bit
           or 64 bit software image is used.";
        reference
          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
           information element.";
      }

      leaf-list supported-virtualization-environment {
        type string;
        description
          "Identifies the virtualisation environments
           (e.g. hypervisor) compatible with this software
           image.";
        reference
          "GS NFV IFA011: Section 7.1.6.5, SwImageDesc
           information element.";
      }
    }

    list int-virtual-link-desc {
      key "id";
      description
        "Represents the type of network connectivity mandated by the
         VNF provider between two or more CPs which includes at
         least one internal CP.";
      reference
        "GS NFV IFA011: Section 7.1.2, Vnfd information element.";

      leaf id {
        type string;
        description
          "Unique identifier of this internal VLD in VNFD.";
        reference
          "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
           Information elements.";
      }

      list flavour {
        key "id";
        description
          "Describes a specific flavour of the VL with specific
             bitrate requirements.";
        reference
          "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
           Information elements.";

        leaf id {
          type string;
          description
            "Identifies a flavour within a VnfVirtualLinkDesc.";
          reference
            "GS NFV IFA011: Section 7.1.8.5, VirtualLinkDescFlavour
             information element.";
        }

        container qos {
          presence "VL QoS parameters";
          description
            "QoS of the VL.";
          reference
            "GS NFV IFA011: Section 7.1.8.5, VirtualLinkDescFlavour
             information element.";

          leaf latency {
            type uint32;
            units "ms";
            mandatory true;
            description
              "Specifies the maximum latency in ms.";
            reference
              "GS NFV IFA011: Section 7.1.8.10, QoS information
               element.";
          }

          leaf packet-delay-variation {
            type uint32;
            units "ms";
            mandatory true;
            description
              "Specifies the maximum jitter in ms.";
            reference
              "GS NFV IFA011: Section 7.1.8.10, QoS information
               element.";
          }

          leaf packet-loss-ratio {
            type decimal64 {
              fraction-digits "2";
              range "0..1.00";
            }
            description
              "Specifies the maximum packet loss ratio.";
            reference
              "GS NFV IFA011: Section 7.1.8.10, QoS information
               element.";
          }
        }
      }

      uses connectivity-type;

      leaf-list test-access {
        type string;
        description
          "Specifies test access facilities expected on the VL
           (e.g. none, passive monitoring, or active (intrusive)
           loopbacks at endpoints.";
        reference
          "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
           information element.";
      }

      leaf description {
        type string;
        description
          "Provides human-readable information on the purpose of
           the VL (e.g. control plane traffic).";
        reference
          "GS NFV IFA011: Section 7.1.7.2, VnfVirtualLinkDesc
           information element.";
      }

      list monitoring-parameters {
        key "id";

        leaf id {
          type string;
          description
            "Unique identifier of the monitoring parameter.";
          reference
            "GS NFV IFA011: Section 7.1.11.3, MonitoringParameter
             information element.";
        }
        uses monitoring-parameter;
      }
    }

    uses security-group-rule;

    list ext-cpd {
      key "id";
      min-elements 1;

      description
        "Describes an external interface exposed by this VNF enabling
         connection with a Virual Link";
      reference
        "GS NFV IFA011: Section 7.1.2, VNFD information element.";

      choice cp-connection {
        leaf int-virtual-link-desc {
          description
            "Reference to the internal Virtual Link Descriptor (VLD)
             to which CPs instantiated from this external CP
             Descriptor (CPD) connect. Either intVirtualLinkDesc or
             intCpd shall be present.";
          type leafref {
            path "/nfv:nfv/nfv:vnfd/nfv:int-virtual-link-desc/nfv:id";
          }
        }

        container int-cpd {
          leaf vdu-id {
            type leafref {
              path "../../../vdu/id";
            }
          }

          leaf cpd {
            type leafref {
              path "deref(../vdu-id)/../int-cpd/id";
            }
          }
        }

        leaf vip-cpd {
          type leafref {
            path "../../vip-cpd/id";
          }
          description
            "Reference to the VIP CPD which is used to instantiate CPs
             to hold virtual IP addresses. These CPs are, in turn,
             exposed as external CPs defined by this external CPD.
             One and only one of the following attributes shall be
             present: intVirtualLinkDesc or intCpd or vipCpd .";
          reference
            "GS NFV-IFA011: Section 7.1.3.2, VnfExtCpd information
             element";
        }
      }

      uses virtual-network-interface-requirements;

      leaf nicio-requirements {
        type leafref {
          path "/nfv:nfv/nfv:vnfd/nfv:virtual-compute-desc/nfv:id";
        }
        description
          "This references (couples) the CPD with any logical node I/O
           requirements (for network devices) that may have been
           created. Linking these attributes is necessary so that so
           that I/O requirements that need to be articulated at the
           logical node level can be associated with the network
           interface requirements associated with the CPD.";
        reference
          "GS NFV-IFA011: Section 7.1.6.6,
           VirtualNetworkInterfaceRequirements information element";
      }
      uses cpd;

      leaf security-group-rule-id {
        type leafref {
          path "../../security-group-rule/id";
        }
        description
          "Reference of the security group rules bound to this
           CPD.";
        reference
          "GS NFV IFA011: Section 7.1.6.3 Cpd information element";
      }
    }

    list vip-cpd {
      key "id";

      leaf-list int-cpd {
        type leafref {
          path "../../vdu/int-cpd/int-virtual-link-desc";
        }
        description
          "Reference to the internal VDU CPD which is used to
           instantiate internal CPs. These internal CPs share the
           virtual IP addresses allocated when a VipCp instance
           is created from the VipCpd.";
        reference
          "GS NFV IFA011: Section 7.1.x, VipCpd information element.";
      }

      leaf-list vnf-ext-cpd {
        type leafref {
          path "../../ext-cpd/id";
        }
        description
          "Reference to the VNF external CPD which is used to
           instantiate external CPs. These external CPs share the
           virtual IP addresses allocated when a VipCp instance is
           created from the VipCpd.";
        reference
          "GS NFV IFA011: Section 7.1.x, VipCpd information element.";
      }

      leaf vip-function {
        type identityref {
          base vip-function;
        }
        description
          "It indicates the function the virtual IP address is used
           for. Permitted values: high availability, load balancing.";
        reference
          "GS NFV IFA011: Section 7.1.x, VipCpd information element.";
      }

      uses cpd;

      description
        "Describes virtual IP addresses to be shared among instances
         of connection points. See clause 7.1.x.";
      reference
        "GS NFV IFA011: Section 7.1.2, VNFD information element.";
    }

    list df {
      must "default-instantiation-level or " +
           "count(instantiation-level) = 1";
      key "id";
      min-elements 1;
      description
        "Describes a specific Deployment Flavour (DF) of a VNF with
         specific requirements for capacity and performance.";
      reference
        "GS NFV IFA011: Section 7.1.2, VNFD information element.";

      leaf id {
        type string;
        description
          "Identifier of this DF within the VNFD.";
        reference
          "GS NFV IFA011: Section 7.1.8, Information elements
           to the DeploymentFlavour.";
      }

      leaf description {
        type string;
        description
          "Human readable description of the deployment flavour";
        reference
          "GS NFV IFA011: Section 7.1.8, Information elements
           to the DeploymentFlavour.";
      }

      list vdu-profile {
        key "id";
        min-elements 1;
        description
          "The Vduprofile describes additional instantiation data for
           a given VDU used in a deployment flavour.";
        reference
          "GS NFV IFA011: Section 7.1.8, Information elements
           to the DeploymentFlavour.";

        leaf id {
          type leafref {
            path "../../../vdu/id";
          }
          reference
            "GS NFV IFA011: Section 7.1.8.3, VduProfile information
             element.";
        }

        leaf min-number-of-instances {
          type uint16;
          default 1;
          description
            "Minimum number of instances of the VNFC based on this
             VDU that is permitted to exist for this flavour.";
          reference
            "GS NFV IFA011: Section 7.1.8.3, VduProfile information
             element.";
        }

        leaf max-number-of-instances {
          type uint16;
          default 1;
          must ". >= ../min-number-of-instances";
          reference
            "GS NFV IFA011: Section 7.1.8.3, VduProfile information
             element.";
        }
        uses local-affinity-or-anti-affinity-rule;

        leaf-list affinity-or-anti-affinity-group-id {
          type leafref {
            path "../../affinity-or-anti-affinity-group/id";
          }
          description
            "Identifier(s) of the affinity or anti-affinity
             group(s) the VDU belongs to.";
          reference
            "GS NFV IFA011: Section 7.1.8.3, VduProfile information
             element.";
        }
      }

      list virtual-link-profile {
        key "id flavour";
        description
          "Defines the internal VLD along with additional data which
           is used in this DF.";
        reference
          "GS NFV IFA011: Section 7.1.8.2, VnfDf information
           element.";

        leaf id {
          type leafref {
            path "/nfv:nfv/nfv:vnfd/nfv:int-virtual-link-desc/nfv:id";
          }
          description
            "Uniquely identifies a Vnf VLD.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }

        leaf flavour {
          type leafref {
            path "deref(../../../ext-cpd/int-virtual-link-desc)" +
                 "/../nfv:flavour/nfv:id";
          }
          description
            "Identifies a flavour within the VnfVirtualLinkDesc.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }
        uses local-affinity-or-anti-affinity-rule;

        leaf-list affinity-or-anti-affinity-group-id {
          type leafref {
            path "../../affinity-or-anti-affinity-group/id";
          }
          description
            "Identifier(s) of the affinity or anti-affinity
             group(s) the VnfVirtualLinkDesc belongs to.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }

        container max-bit-rate-requirements {
          leaf root {
            mandatory "true";
            type uint32;
            description
              "Throughput requirement of the link (e.g. bitrate of
               E-Line, root bitrate of E-Tree, aggregate capacity
               of E-LAN).";
            reference
              "GS NFV IFA011: Section 7.1.8.6,
               LinkBitrateRequirements information element.";
          }

          leaf leaf {
            type uint32;
            description
              "Throughput requirement of leaf connections to the
               link when applicable to the connectivity type
               (e.g. for E-Tree and E-LAN branches).";
            reference
              "GS NFV IFA011: Section 7.1.8.6,
               LinkBitrateRequirements information element.";
          }
          description
            "Specifies the maximum bitrate requirements for a VL
             instantiated according to this profile.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }

        container min-bit-rate-requirements {
          leaf root {
            mandatory "true";
            type uint32;
            description
              "Throughput requirement of the link (e.g. bitrate of
               E-Line, root bitrate of E-Tree, aggregate capacity
               of E-LAN).";
            reference
              "GS NFV IFA011: Section 7.1.8.6,
               LinkBitrateRequirements information element.";
          }

          leaf leaf {
            type uint32;
            description
              "Throughput requirement of leaf connections to the
               link when applicable to the connectivity type
               (e.g. for E-Tree and E-LAN branches).";
            reference
              "GS NFV IFA011: Section 7.1.8.6,
               LinkBitrateRequirements information element.";
          }
          description
            "Specifies the minimum bitrate requirements for a VL
             instantiated according to this profile.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }

        container virtual-link-protocol-data {
          leaf associated-layer-protocol {
            type identityref {
              base layer-protocol;
            }
            description
              "One of the values of the attribute layerProtocol of
               the ConnectivityType IE.";
            reference
              "GS NFV IFA011: Section 7.1.8.13,
               VirtualLinkProtocolData information element.";
          }

          container l2-protocol-data {
            when "(../associated-layer-protocol = 'Ethernet') or " +
                 "(../associated-layer-protocol = 'MPLS') or " +
                 "(../associated-layer-protocol = 'ODU2') or " +
                 "(../associated-layer-protocol = 'Pseudo-Wire')";

            leaf name {
              type string;
              description
                "Network name associated with this L2 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.14,
                 L2ProtocolData information element.";
            }

            leaf network-type {
              type enumeration {
                enum flat;
                enum vlan;
                enum vxlan;
                enum gre;
              }
              description
                "Specifies the network type for this L2 protocol.
                 Possible values: FLAT, VLAN, VXLAN, GRE.";
              reference
                "GS NFV IFA011: Section 7.1.8.14,
                 L2ProtocolData information element.";
            }

            leaf vlan-transparent {
              type boolean;
              description
                "Specifies whether to support VLAN transparency for
                 this L2 protocol or not.";
              reference
                "GS NFV IFA011: Section 7.1.8.14,
                 L2ProtocolData information element.";
            }

            leaf mtu {
              type uint16;
              description
                "Specifies the maximum transmission unit (MTU) value
                 for this L2 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.14,
                 L2ProtocolData information element.";
            }

	    leaf segmentation-id {
	      type string;
	      description
                "If present, specifies a specific virtualised network
                 segment, which depends on the network type. For e.g.,
                 VLAN ID for VLAN network type and tunnel ID for
                 GRE/VXLAN network types.";
	      reference
                "GS NFV IFA011: Section 7.1.8.14,
                 L2ProtocolData information element.";
	    }

            description
              "Specifies the L2 protocol data for this virtual link.
               Shall be present when the associatedLayerProtocol
               attribute indicates a L2 protocol and shall be absent
               otherwise.";
            reference
              "GS NFV IFA011: Section 7.1.8.13,
               VirtualLinkProtocolData information element.";
          }

          container l3-protocol-data {
            when "(../associated-layer-protocol = 'IPv4') or " +
                 "(../associated-layer-protocol = 'IPv6')";

            leaf name {
              type string;
              description
                "Network name associated with this L3 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf ip-version {
              type enumeration {
                enum ipv4;
                enum ipv6;
              }
              default "ipv4";
              description
                "Specifies IP version of this L3 protocol.
                 Value:
                 • IPV4.
                 • IPV6.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf cidr {
              type string;
              description
                "Specifies the CIDR (Classless InterDomain Routing)
                 of this L3 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf-list ip-allocation-pools {
              type string;
              description
                "Specifies the allocation pools with start and end
                 IP addresses for this L3 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf gateway-ip {
              type inet:ip-address;
              description
                "Specifies the gateway IP address for this L3
                 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf dhcp-enabled {
              type boolean;
              default "true";
              description
                "Indicates whether DHCP (Dynamic Host Configuration
                 Protocol) is enabled or disabled for this L3
                 protocol.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }

            leaf ipv6-address-mode {
              when "../ip-version = 'ipv6'";
              type enumeration {
                enum slaac;
                enum dhcpv6-stateful;
                enum dhcpv6-stateless;
              }
              description
                "Specifies IPv6 address mode. Possible values:
                 • SLAAC.
                 • DHCPV6-STATEFUL.
                 • DHCPV6-STATELESS.
                 May be present when the value of the ipVersion
                 attribute is 'IPV6' and shall be absent otherwise.";
              reference
                "GS NFV IFA011: Section 7.1.8.15,
                 L3ProtocolData information element.";
            }
            description
              "Specifies the L3 protocol data for this virtual link.
               Shall be present when the associatedLayerProtocol
               attribute indicates a L3 protocol and shall be absent
               otherwise.";
            reference
              "GS NFV IFA011: Section 7.1.8.13,
               VirtualLinkProtocolData information element.";
          }
          description
            "Specifies the protocol data for a VL instantiated
             according to this profile. Cardinality 0 is used when
             no protocol data needs to be specified.";
          reference
            "GS NFV IFA011: Section 7.1.8.4, VirtualLinkProfile
             information element.";
        }
      }

      list instantiation-level {
        key "id";
        min-elements 1;
        description
          "Describes the various levels of resources that can be
           used to instantiate the VNF using this flavour.
           Examples: Small, Medium, Large. If there is only one
           'instantiationLevel' entry, it shall be treated as the
           default instantiation level for this DF.

           The InstantiationLevel information element describes a
           given level of resources to be instantiated within a
           deployment flavour in term of the number of VNFC instances
           to be created from each VDU.
           All the VDUs referenced in the level shall be part of the
           corresponding deployment flavour and their number shall
           be within the range (min/max) for this deployment flavour.";
        reference
          "GS NFV IFA011: Section 7.1.8.2 VnfDf information element";

        leaf id {
          type string;
          description
            "Uniquely identifies a level with the DF.";
          reference
            "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
             information element";
        }

        leaf description {
          type string;
          description
            "Human readable description of the instantiation level";
          reference
            "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
             information element";
        }

        list vdu-level {
          key "vdu-id";
          min-elements 1;
          description
            "Sets the number of instances for the VDU in this
             instantiation level.";
          reference
            "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
             information element";

          leaf vdu-id {
            type leafref {
              path "../../../../vdu/id";
            }
            description
              "Uniquely identifies a VDU.";
            reference
              "GS NFV IFA011: Section 7.1.8.9 VduLevel information
               element";
          }

          leaf number-of-instances {
            type uint16;
            must ". <= ../../../../df/" +
                 "vdu-profile[id=current()/../vdu-id]/" +
                 "max-number-of-instances";
            must ". >= ../../../../df/" +
                 "vdu-profile[id=current()/../vdu-id]/" +
                 "min-number-of-instances";
            default 1;
            description
              "Number of instances of VNFC based on this VDU to
               deploy for this level.";
            reference
              "GS NFV IFA011: Section 7.1.8.9 VduLevel information
               element";
          }
        }

        list scaling-info {
          key "scaling-aspect-id";
          description
            "The InstantiationLevel information element describes a
             given level of resources to be instantiated within a
             DF in term of the number of VNFC instances to be
             created from each VDU.";
          reference
            "GS NFV IFA011: Section 7.1.8.7 InstantiationLevel
             information element";

          leaf scaling-aspect-id {
            type leafref {
              path "../../../scaling-aspect/id";
            }
            description
              "Identifier of the scaling aspect.";
            reference
              "GS NFV IFA011: Section 7.1.8.8 ScaleInfo information
               element";
          }

          leaf scale-level {
            type uint32;
            description
              "The scale level, greater than or equal to 0.";
            reference
              "GS NFV IFA011: Section 7.1.8.8 ScaleInfo information
               element";
          }
        }
      }

      leaf default-instantiation-level {
        type leafref {
          path "../instantiation-level/id";
        }
        description
          "This attribute references the 'instantiationLevel'
           entry which defines the default instantiation level for
           this DF. It shall be present if there are multiple
           'instantiationLevel' entries.";