{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.mpai.community/PGM1/V1.0/data/UnmatchedEntities.json",
  "title": "Unmatched Entities V1.0",
  "description": "The Audio Entities and the Visual Entities left without counterpart in the other modality by Correspondence Resolution, each with the reason. An Unmatched Entity is an ordinary state of a Space, not a failure.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "Header",
    "MInstance",
    "UEnvironment",
    "SessionID",
    "UnmatchedEntitiesID",
    "UnmatchedEntitiesTime",
    "Entities"
  ],
  "properties": {
    "Header": {
      "type": "string",
      "const": "PGM-UME-V1.0"
    },
    "MInstance": {
      "type": "string",
      "description": "Identifier of the M-Instance."
    },
    "UEnvironment": {
      "type": "string",
      "description": "Identifier of the U-Environment."
    },
    "SessionID": {
      "type": "string",
      "description": "Identifier of the A-User session."
    },
    "UnmatchedEntitiesID": {
      "type": "string",
      "description": "Identifier of this instance."
    },
    "UnmatchedEntitiesTime": {
      "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SimpleTime.json"
    },
    "Entities": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "Modality": {
            "type": "string",
            "enum": [
              "audio",
              "visual"
            ],
            "description": "The modality of the Entity."
          },
          "EntityID": {
            "type": "string"
          },
          "Reason": {
            "type": "string",
            "enum": [
              "no_candidate",
              "lost_competing_claim",
              "excluded_by_directive",
              "other"
            ],
            "description": "The reason."
          },
          "Description": {
            "type": "string",
            "description": "Description of the reason."
          }
        },
        "required": [
          "Modality",
          "EntityID",
          "Reason"
        ]
      },
      "description": "The Entities."
    },
    "DataXMData": {
      "$ref": "https://schemas.mpai.community/PTF/V1.0/data/DataExchangeMetadata.json"
    },
    "DescrMetadata": {
      "type": "string",
      "maxLength": 2048
    }
  }
}