submodule bbf-xponvani-v-ani-body {

    yang-version 1.1;

    belongs-to bbf-xponvani {
        prefix bbf-xponvani;
    }

    import ietf-interfaces {
      prefix if;
    }
    import bbf-xpon-if-type {
      prefix bbf-xponift;
    }
    import ietf-yang-types {
      prefix yang;
    }
    import bbf-xpon {
      prefix bbf-xpon;
    }
    import bbf-xpon-types {
      prefix bbf-xpon-types;
    }
    import bbf-xpon-onu-types {
      prefix bbf-xpon-onu-types;
    }
    import bbf-xpon-defects {
      prefix bbf-xpon-def;
    }

    include bbf-xponvani-base;

    organization
      "Broadband Forum <https://www.broadband-forum.org>
Fiber Access Networks Work Area";

    contact
      "Comments or questions about this Broadband Forum YANG module
should be directed to <mailto:info@broadband-forum.org>.

Editor:      Robert Peschi, Nokia

Editor:      Kevin Noll, Vecima

PS Leader:   Joey Boyd, Adtran

WA Director: Marta Seda, Calix";

    description
      "This submodule contains the data for managing the virtual Access
Network Interface (vANI). A vANI belongs to the Optical Line
Termination (OLT) and represents an Optical Network Unit (ONU) as
seen from the perspective of the OLT.

Copyright (c) 2018-2023, Broadband Forum

Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above
   copyright notice, this list of conditions and the following
   disclaimer in the documentation and/or other materials
   provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products
   derived from this software without specific prior written
   permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The above license is used as a license under copyright only.
Please reference the Forum IPR Policy for patent licensing terms
<https://www.broadband-forum.org/ipr-policy>.

Any moral rights which are necessary to exercise under the above
license grant are also deemed granted under this license.

This version of this YANG module is part of TR-385i2a1; see
the TR itself for full legal notices.";

    revision "2023-06-21" {
      description
        "Issue 2 Amendment 1.
* Approval Date:    2023-06-21.
* Publication Date: 2023-06-21.";
      reference
        "TR-385i2a1: ITU-T PON YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-385_Issue-2_Amendment-1.pdf>";

    }

    revision "2020-10-13" {
      description
        "Issue 2.
* Approval Date:    2020-10-13.
* Publication Date: 2020-10-13.";
      reference
        "TR-385i2: ITU-T PON YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-385_Issue-2.pdf>";

    }

    revision "2020-01-31" {
      description
        "Corrigendum 1.
* Approval Date:    2020-01-31.
* Publication Date: 2020-01-31.";
      reference
        "TR-385c1: ITU-T PON YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-385.pdf>";

    }

    revision "2019-02-25" {
      description
        "Initial revision.
* Approval Date:    2019-02-25.
* Publication Date: 2019-02-25.";
      reference
        "TR-385: ITU-T PON YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-385.pdf>";

    }


    feature configurable-v-ani-onu-id {
      description
        "Indicates support for configuration of the Optical Network Unit
(ONU) ID associated with the virtual Access Network Interface
(vANI).";
    }

    feature configurable-v-ani-management-gem-port-id {
      description
        "Indicates support for configuration of the management
GPON Encapsulation Method (GEM) port.";
    }

    feature v-ani-defect-notifications {
      description
        "Indicates support for reporting state change of the defects
associated with the virtual Access Network Interface (vANI).";
    }

    grouping v-ani-config-data {
      description
        "Configuration data intended for the Optical Line Termination
(OLT) about the Optical Network Unit (ONU) image.";
      leaf onu-id {
        if-feature bbf-xponvani:configurable-v-ani-onu-id;
        type bbf-xpon-types:onu-id;
        description
          "This is the Transmission Convergence (TC) layer ONU-ID
identifier. When configured this is the value which the
Optical Line Termination (OLT) must assign to an Optical
Network Unit (ONU) during the ONU's activation using the
Assign_ONU-ID PLOAM message. For GPON the value should
be in [0..253], for XG-PON it should be in [0..1022] and
for XGS-PON and NG-PON2 it should be in [0..1020].";
        reference
          "ITU-T G.984.3 clause 5.5.2
          ITU-T G.987.3 clause 6.4.2
          ITU-T G.9807.1 clause C.6.1.5.6
          ITU-T G.989.3 clause 6.1.5.6";

      }

      leaf channel-partition {
        type if:interface-ref;
        must
          "derived-from-or-self(/if:interfaces/if:interface[if:name=current()]/if:type,'bbf-xponift:channel-partition')" {
          error-message
            "Must reference a channel partition";
        }
        description
          "Reference to the parent interface of the virtual Access
Network Interface (vANI).";
      }

      leaf expected-serial-number {
        type bbf-xpon-types:onu-serial-number;
        description
          "The serial number the Optical Line Termination (OLT) expects
to retrieve from the Optical Network Unit (ONU). The serial
number is unique for each ONU. It contains the vendor ID and
vendor specific serial number. The first four bytes are an
ASCII-encoded vendor ID four letter mnemonic. The second four
bytes are a binary encoded serial number, under the control
of the ONU vendor.";
        reference
          "ITU-T G.984.3, clause 9.2.4.1
          ITU-T G.987.3, clause 11.3.3.2
          ITU-T G.9807.1, clauses C11.2.6.1, C11.2.6.2 and C11.3.4.1
          ITU-T G.989.3, clauses 11.2.6.1, 11.2.6.2 and 11.3.4.1.";

      }

      leaf expected-registration-id {
        type bbf-xpon-types:onu-registration-id;
        default "";
        description
          "A string that has been assigned to the subscriber on the
management level, entered into and stored in non-volatile
storage at the Optical Network Unit (ONU). Registration ID
may be useful in identifying a particular ONU installed at a
particular location. Each octet is represented as 2
hexadecimal characters, therefore the leaf must contain an
even number of characters.

For ITU-T G.984.3, the leaf can only be up to 20 characters
long (refer to 'password' 10 bytes long).

For ITU-T G.987.3, ITU-T G.9807.3 and ITU-T G.989.3 the
leaf can be up to 72 characters long (refer to
'registration id' 36 bytes long).";
        reference
          "ITU-T G.984.3 clause 9.2.4.2
          ITU-T G.987.3 clause 11.3.4.2
          ITU-T G.9807.3 clause C.11.3.4.2
          ITU-T G.989.3 clause 11.3.4.2";

      }

      leaf preferred-channel-pair {
        type if:interface-ref;
        must
          "derived-from-or-self(/if:interfaces/if:interface[if:name=current()]/if:type,'bbf-xponift:channel-pair') and /if:interfaces/if:interface[if:name=current()]/bbf-xpon:channel-pair/bbf-xpon:channel-partition-ref=../channel-partition and (not(../protection-channel-pair) or (current() != ../protection-channel-pair))" {
          error-message
            "Must reference a channel pair which belongs to the same channel partition. The preferred channel pair cannot be the same as the protection channel pair";
        }
        description
          "The preferred channel pair is the channel pair that an
activating Optical Network Unit (ONU) is intended to use.
If the preferred channel pair interface is not available,
the ONU should use the protection channel pair if it is
provisioned and available. Modification of the preferred
channel pair has no effect on the ONU when it is activated
(e.g., reconfiguration of the preferred channel pair should
not cause an activated ONU to need to retune its receiver).";
      }

      leaf protection-channel-pair {
        type if:interface-ref;
        must
          "derived-from-or-self(/if:interfaces/if:interface[if:name=current()]/if:type,'bbf-xponift:channel-pair') and /if:interfaces/if:interface[if:name=current()]/bbf-xpon:channel-pair/bbf-xpon:channel-partition-ref=../channel-partition" {
          error-message
            "Must reference a channel pair and the channel pair should belong to same channel partition. The protection channel pair cannot be the same as the preferred channel pair.";
        }
        description
          "The protection channel pair is the channel pair that an
activating Optical Network Unit (ONU) is intended to use if
the preferred channel pair is not available. When the ONU is
activated on a given current channel pair, the protection
channel pair is also the channel pair which the ONU will tune
to if the current channel pair becomes not available.
Modification of the protection channel pair has no effect on
the ONU when it is activated (e.g., reconfiguration of the
protection channel pair should not cause an activated ONU to
need to retune its receiver).";
      }

      leaf upstream-channel-speed {
        type yang:gauge64;
        units "bits per second";
        description
          "Upstream channel speed for this interface in bits per
second.";
      }

      leaf upstream-fec {
        type boolean;
        default "false";
        description
          "If 'true', enable Forward Error Correction (FEC) in
the upstream direction for this specific Optical Network
Unit (ONU). If 'false', disable FEC in the upstream
direction for this specific ONU.";
        reference
          "ITU-T G.984.3 clause 13.3.1.1
          ITU-T G.987.3 clause 10.2
          ITU-T G.9807.1 clause C.10.1.3.2.4
          ITU-T G.989.3 clause 10.1.3.2.4";

      }

      leaf management-gemport-id {
        when
          "derived-from-or-self(/if:interfaces/if:interface[if:name = current()/../preferred-channel-pair]/bbf-xpon:channel-pair/bbf-xpon:channel-pair-type,'bbf-xpon-types:gpon') or derived-from-or-self(/if:interfaces/if:interface[if:name = current()/../protection-channel-pair]/bbf-xpon:channel-pair/bbf-xpon:channel-pair-type, 'bbf-xpon-types:gpon')";
        if-feature bbf-xponvani:configurable-v-ani-management-gem-port-id;
        type uint32;
        description
          "In contrast with other xPON technologies, in the case of
GPON, there is no requirement that the ITU-T Transmission
Convergence (TC) ID of the management GPON Encapsulation
Method (GEM) port for the Optical Network Unit (ONU) is
numerically equal to the ONU-ID. This leaf provides the
capability to specify a specific value to the management GEM
port ID. If this leaf is not configured the management GEM
port ID must be numerically equal to the ONU-ID.

This configuration is ignored for XG-PON, XGS-PON and
NG-PON2 as the 'management-gemport-id' is implicitly
configured to be the same as the ONU-ID.";
        reference
          "ITU-T G.984.3 clause 5.5.5
          ITU-T G.987.3 clause 6.4.4
          ITU-T G.9807.1 clause C.6.1.5.8
          ITU-T G.989.3, clause 6.1.5.8";

      }

      leaf management-gemport-aes-indicator {
        type boolean;
        default "false";
        description
          "If 'true', enable Advanced Encryption Standard (AES)
for the management GPON Encapsulation Method (GEM) port
of this Optical Network Unit (ONU). If 'false', disable
AES for the management GEM port of this ONU.

For GPON, this applies in the downstream direction. For
XG-PON, XGS-PON and NG-PON2, this applies to both the
upstream and downstream directions.";
        reference
          "ITU-T G.984.3 section 12.1
          ITU-T G.987.3 section 15.5.1
          ITU-T G.9807.1 clause C.15.5.1
          ITU-T G.989.3 clause 15.5.1.";

      }

      action in-service-onu-tune-request {
        description
          "Requests an Optical Network Unit (ONU) which is in
service on a current channel termination to tune to a
specific target channel termination. The action must be
directed to the Optical Line Termination (OLT) currently
providing service to the ONU. The target channel termination
must relate to a channel pair which belongs to the specific
channel partition on which the ONU is configured.
If the target channel termination is the same as the channel
ternmination currently used by the ONU, the action will have
no effect but will nevertheless be reported as successful. If
the action is sent to an OLT not providing service to the ONU
(e.g., because the ONU is not activated or is getting service
from another OLT, the action must be rejected.";
        input {
          leaf target-channel-termination-ref {
            type if:interface-ref;
            must
              "derived-from-or-self(/if:interfaces/if:interface[if:name=current()]/if:type,'bbf-xponift:channel-termination') and (/if:interfaces/if:interface[if:name=/if:interfaces/if:interface[if:name=current()]/bbf-xpon:channel-termination/bbf-xpon:channel-pair-ref]/bbf-xpon:channel-pair/bbf-xpon:channel-partition-ref = ../../bbf-xponvani:channel-partition)" {
              error-message
                "Must reference a channel termination which is related to a channel pair which is in the same channel partition as the one which the Optical Network Unit (ONU) is configured on.";
            }
            description
              "Reference to the channel termination which the Optical
Network Unit (ONU) should tune to. This channel
termination must relate to a channel pair belonging to
the same channel partition as the one which the ONU is
configured on.";
          }
        }

        output {
          leaf onu-tune-request-status {
            type identityref {
              base bbf-xpon-types:action-request-status;
            }
            description
              "Indicates what the Optical Line Termination (OLT) is
doing when receiving the action. The OLT can for instance
indicate that the action is in progress or has been
rejected.";
          }

          leaf onu-tune-request-reject-string {
            when
              "not(derived-from-or-self(../onu-tune-request-status,'bbf-xpon-types:request-being-processed'))" {
              description
                "Only valid when the Optical Line Termination (OLT) has
rejected the tune request.";
            }
            type string;
            description
              "A text string indicating the reason why the Optical Line
Termination (OLT) rejected the action.";
          }
        }
      }  // rpc in-service-onu-tune-request

      leaf-list notifiable-defect {
        if-feature bbf-xponvani:v-ani-defect-notifications;
        type identityref {
          base bbf-xpon-def:items-detected-at-olt-for-v-ani;
        }
        description
          "Optical Line Termination (OLT) is expected to generate a
'defect-state-change' notification each time defect(s)
listed in this leaf-list are raised or cleared.
If 'notifiable-defect' includes an identity which
is the base value for other defect(s) identity(ies),
the OLT will generate a single notification when status of
any defect derived from this base value changes.

In case the leaf-list is empty (as by default) the OLT
should not generate any 'defect-state-change'
notification.";
      }
    }  // grouping v-ani-config-data

    grouping v-ani-state-data {
      description
        "State data which the Optical Line Termination (OLT) can form
about its image of the Optical Network Unit (ONU).";
      leaf onu-id {
        type bbf-xpon-types:onu-id;
        description
          "This is the ITU-T Transmission Convergence (TC) layer ONU-ID
identifier which the Optical Line Termination (OLT) has
assigned to the Optical Network Unit (ONU) during the ONU's
activation using the Assign_ONU-ID PLOAM message. It
identifies an ONU on a channel group and is unique on a
channel group.";
        reference
          "ITU-T G.984.3 clause 5.5.2
          ITU-T G.987.3 clause 6.4.2
          ITU-T G.9807.1 clause C.6.1.5.6
          ITU-T G.989.3 clause 6.1.5.6";

      }

      leaf management-tcont-alloc-id {
        type uint32;
        description
          "The ITU-T Transmission Convergence (TC) Allocation ID
(Alloc-ID) of the management T-CONT for the Optical Network
Unit (ONU). It has the same numerical value as the ITU-T TC
ONU-ID.";
        reference
          "Refer to 'Default Alloc-ID' in
          ITU-T G.987.3 clause 6.1.5.7
          ITU-T G.9807.1 clause C.6.1.5.7
          ITU-T G.987.3 clause 6.4.3
          ITU-T G.984.3 clause 5.5.3";

      }

      leaf management-gemport-id {
        type uint32;
        description
          "The ITU-T Transmission Convergence (TC) Id of the management
GPON Encapsulation Methiod (GEM) port for the Optical
Network Unit (ONU). For NG-PON2, XGS-PON and XG-PON, it has
the same numerical value as the ITU-T TC ONU-ID. For GPON,
its value is not necessarily numerically equal to the
ONU-ID.";
        reference
          "Refer to 'OMCC Port-ID' in
          ITU-T G.987.3 clause 6.1.5.8
          ITU-T G.9807.1 clause C.6.1.5.8
          ITU-T G.987.3 clause 6.4.4
          ITU-T G.984.3 clause 5.5.5";

      }

      leaf onu-presence-state {
        type identityref {
          base bbf-xpon-onu-types:onu-presence-state-base;
        }
        description
          "Presence state data which the Optical Line Termination
(OLT) can form about an Optical Network Unit (ONU) for
which a virtual Access Network Interface (vANI) is
configured. The most specific applicable identity should be
reported.";
      }

      leaf-list active-defects {
        type identityref {
          base bbf-xpon-def:items-detected-at-olt-for-v-ani;
        }
        description
          "Defects detected by Optical Line Termination (OLT) for
given Optical Network Unit (ONU) for which a virtual Access
Network Interface (vANI) is configured. All applicable
identities should be reported.";
        reference
          "ITU-T G.984.3 (01/2014) 11.1.1
          ITU-T G.987.3 (01/2014) 14.2.1
          ITU-T G.989.3 (2015)/Amd.2 (11/2018) Table 14-2
          ITU-T G.9807.1 (2016)/Amd.1 (10/2017) Table C.14.2";

      }

      container onu-present-on-this-olt {
        presence
          "If present, this container indicates that the Optical Network
Unit (ONU) is using the optical signal of one of the channel
terminations local to this Optical Line Termination (OLT)
(Refer to 'inside-olt'). If the container is not present it
means that the ONU is not using the optical signal of any
channel termination local to this OLT; this could mean that
the ONU is using the optical signal of a channel termination
belonging to another OLT, or that the ONU is not using any
optical signal at all. An OLT considers that an ONU is using
the optical signal of one of its local channel terminations
as early as it receives from the ONU a PLOAM
Serial_Number_ONU message or as early as it receives a PLOAM
Tuning_Resp(Complete_u) message and as long as the channel
termination is not in LOBi state for this ONU (i.e in
practice the ONU keeps responding to downstream OLT bandwidth
map messages).";
        description
          "When an Optical Network Unit (ONU) is using the optical
signal of one of the channel terminations local to this
Optical Line Termination (OLT) (Refer to 'inside-olt'), this
container contains state data such as which channel pair
and which channel termination the ONU is using.";
        reference
          "ITU-T G.989.3 clause 11.3.2, 12.2.2.1 and 14.2.1";

        leaf onu-present-on-this-channel-pair {
          type if:interface-ref;
          mandatory true;
          description
            "This leaf indicates the channel pair on which the Optical
Network Unit (ONU) is currently present in case the ONU is
using optical signal from this Optical Line Termination
(OLT).";
        }

        leaf onu-present-on-this-channel-termination {
          type if:interface-ref;
          mandatory true;
          description
            "This leaf indicates the channel termination on which the
Optical Network Unit (ONU) is currently present in case
the ONU is using optical signal from this Optical Line
Termination (OLT).";
        }

        leaf onu-fiber-distance {
          type uint32;
          units "meters";
          description
            "This optional leaf reports Optical Network Unit (ONU) fiber
distance in meters. The measurement method is
implementation-specific. ITU-T recommendated method allows
fiber distance measurement with 1% precision.";
          reference
            "ITU-T G.9807.1 clause C.13.1.8, G.989.3,
            G.987.3 clause 13.1.8 and G.984.3 clause 10.3.6.";

        }

        leaf detected-serial-number {
          type bbf-xpon-types:onu-serial-number;
          description
            "The serial number of the Optical Network Unit (ONU).";
          reference
            "ITU-T G.984.3, clause 9.2.4.1
            ITU-T G.987.3, clause 11.3.3.2
            ITU-T G.9807.1, clauses C11.2.6.1, C11.2.6.2 and
            C11.3.4.1
            ITU-T G.989.3, clauses 11.2.6.1, 11.2.6.2 and 11.3.4.1.";

        }

        leaf detected-registration-id {
          type bbf-xpon-types:onu-registration-id;
          description
            "The registration ID value which the Optical Line
Termination (OLT) has received from the Optical Network
Unit (ONU). This leaf is not present if the ONU has not
provided any registration ID to the OLT. Registration ID
may be useful in identifying a particular ONU installed
at a particular location. Each octet is represented as 2
hexadecimal characters, therefore the leaf must contain an
even number of characters. For ITU-T G.984.3, the leaf
can only be up to 20 octets long (refer to 'password'),
for ITU-T G.987.3, ITU-T G.9807.3 and ITU-T G.989.3
the leaf can be up to 72 octets long.";
          reference
            "ITU-T G.984.3 clause 9.2.4.2
            ITU-T G.987.3 clause 11.3.4.2
            ITU-T G.9807.3 clause C.11.3.4.2
            ITU-T G.989.3 clause 11.3.4.2";

        }
      }  // container onu-present-on-this-olt

      container onu-wl-protected {
        presence
          "If present, this container indicates that the Optical Network
Unit (ONU) is effectively wavelength protected, i.e., that it
has been told by the Optical Line Termination (OLT) about the
'protecting' channel termination it should autonomously tune
to in case the channel termination currently used would fail.
This container can only be present in case that the ONU uses
a multi-wavelength xPON technology such as for instance
NG-PON2. If the container is not present it means that the
ONU is not wavelength protected.";
        description
          "When the Optical Network Unit (ONU) is wavelength protected,
this container contains state data related to its wavelength
protection, such as the protecting channel-termination it has
been told by the Optical Line Termination (OLT).";
        reference
          "ITU-T G.989.3 clause 11.3.2, 12.2.2.1 and 14.2.1";

        leaf wl-protecting-ct-announced-to-onu {
          type if:interface-ref;
          description
            "This leaf is relevant when wavelength protection is
provided to the Optical Network Unit (ONU). It indicates
the channel termination which the ONU can tune to in case
the current channel termination would fail. This
information is announced to the ONU via the
'Protection_Control' downstream PLOAM message.";
          reference
            "ITU-T G.989.3 clause 11.3.1 and 11.3.3.15";

        }
      }  // container onu-wl-protected

      notification defect-state-change {
        if-feature bbf-xponvani:v-ani-defect-notifications;
        description
          "A notification traceable to a virtual Access Network
Interface (vANI) which signifies that defect(s) detected
by an Optical Line Termination (OLT) have been raised and/or
cleared. Such notification is only generated for defects
listed in the 'notifiable-defect' leaf list.";
        list defect {
          key "type";
          description
            "A notifiable defect that has changed state since
the previous 'defect-state-change' notification.";
          leaf type {
            type identityref {
              base bbf-xpon-def:items-detected-at-olt-for-v-ani;
            }
            description "Defect type.";
          }

          leaf state {
            type bbf-xpon-def:defect-state;
            mandatory true;
            description
              "The current defect state.";
          }

          leaf last-change {
            type yang:date-and-time;
            mandatory true;
            description
              "The Optical Line Termination (OLT) system date and
time when the OLT has declared that the defect
state has changed.";
          }
        }  // list defect
      }  // notification defect-state-change
    }  // grouping v-ani-state-data

    augment /if:interfaces/if:interface/bbf-xponvani:v-ani {
      description
        "Configuration of an xPON virtual Access Network Interface
(vANI), i.e., an Optical Network Unit (ONU) as seen by the
Optical Line Termination (OLT).";
      uses v-ani-config-data;
    }

    augment /if:interfaces-state/if:interface/bbf-xponvani:v-ani {
      description
        "State data of an xPON virtual Access Network Interface (vANI),
i.e., an Optical Network Unit (ONU) as seen by the Optical Line
Termination (OLT).";
      uses v-ani-state-data;
    }
  }  // submodule bbf-xponvani-v-ani-body