{ "$schema":              "https://json-schema.org/draft/2020-12/schema",
  "$id":                  "https://schemas.mpai.community/NNW1/V1.2/data/Payload.json",
  "title":                "Payload V1.2",
  "description":          "The Symbols carried by a watermark. They are injected (original payload) and may be altered during delivery.",
  "type":                 "object",
  "additionalProperties": false,
  "required":             [ "Header", "PayloadID", "PayloadData" ],
  "properties":           {

    "Header":             { "type": "string", "const": "NNW-PLD-V1.2" },
    "MInstanceID":        { "type": "string" },
    "UEnvironmentID":     { "type": "string" },
    "PayloadID":          { "type": "string", "minLength": 1 },
    "PayloadTime":        { "$ref": "https://schemas.mpai.community/OSD/V1.5/data/SimpleTime.json" },

    "PayloadData":        { "type": "array", "minItems": 1, "items": { "type": ["integer", "number", "string"] },
                            "description": "The Symbols of the payload: each is a binary, numerical or string element." },

    "DataXMData":         { "$ref": "https://schemas.mpai.community/PTF/V1.0/data/DataExchangeMetadata.json" },
    "DescrMetadata":      { "type": "string", "maxLength": 2048 } } }