{
  "name": "Milestone",
  "description": "A planned target that groups tasks within a project: a version in Redmine, a milestone in GitHub or GitLab, a fix version in Jira. It has a name, a due date and a state. Type https://datamodels.jp/ns/task/Milestone; @context https://datamodels.jp/context/task/v1.jsonld.",
  "strict": true,
  "schema": {
    "type": "object",
    "properties": {
      "name": {
        "type": "string",
        "description": "Name"
      },
      "description": {
        "type": [
          "string",
          "null"
        ],
        "description": "Description"
      },
      "project": {
        "type": [
          "string",
          "null"
        ],
        "description": "The project this belongs to (a URI)"
      },
      "start": {
        "anyOf": [
          {
            "type": "string",
            "format": "date"
          },
          {
            "type": "string",
            "format": "date-time"
          },
          {
            "type": "null"
          }
        ],
        "description": "Planned start: a date, or a date and time"
      },
      "due": {
        "anyOf": [
          {
            "type": "string",
            "format": "date"
          },
          {
            "type": "string",
            "format": "date-time"
          },
          {
            "type": "null"
          }
        ],
        "description": "Due: the planned release or completion, a date or a date and time"
      },
      "milestoneStatus": {
        "type": [
          "string",
          "null"
        ],
        "enum": [
          "open",
          "locked",
          "closed",
          null
        ],
        "description": "State: open, locked (no new tasks may be added) or closed; status is protected in the core context, hence milestoneStatus"
      },
      "source": {
        "type": [
          "string",
          "null"
        ],
        "description": "URL of this object in the system of record (a URI)"
      },
      "externalId": {
        "type": [
          "string",
          "null"
        ],
        "description": "Identifier in the system of record"
      },
      "dateCreated": {
        "type": [
          "string",
          "null"
        ],
        "format": "date-time",
        "description": "Creation time in the system of record (distinct from the broker attribute createdAt)"
      },
      "dateModified": {
        "type": [
          "string",
          "null"
        ],
        "format": "date-time",
        "description": "Last modification time in the system of record"
      }
    },
    "required": [
      "name",
      "description",
      "project",
      "start",
      "due",
      "milestoneStatus",
      "source",
      "externalId",
      "dateCreated",
      "dateModified"
    ],
    "additionalProperties": false
  }
}