{
  "$id": "https://unomi.apache.org/schemas/json/contextrequest/source/1-0-0",
  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "title": "Item",
  "type": "object",
  "properties" : {
    "itemId" : {
      "type" : ["null","string"],
      "pattern" : "^(\\w|[-_@\\./]){0,100}$",
      "description" : "The identifier for the item"
    },
    "itemType" : {
      "type" : "string",
      "description" : "The type for the item"
    },
    "scope" : {
      "type" : ["null","string"],
      "description" : "The item's scope"
    },
    "version" : {
      "type" : ["null","integer"],
      "minimum" : 0,
      "description" : "The item's version number"
    },
    "systemMetadata" : {
      "type" : ["null","object"],
      "description" : "Any system metadata for the item",
      "maxProperties" : 50
    }
  }
}