{
  "$schema": "http://json-schema.org/draft-03/schema#",
  "id": "http://popoloproject.com/schemas/post.json#",
  "title": "Post",
  "description": "A position that exists independent of the person holding it",
  "type": "object",
  "properties": {
    "id": {
      "description": "The post's unique identifier",
      "type": ["string", "null"]
    },
    "label": {
      "description": "A label describing the post",
      "type": "string",
      "required": true
    },
    "role": {
      "description": "The function that the holder of the post fulfills",
      "type": ["string", "null"]
    },
    "organization_id": {
      "description": "The ID of the organization in which the post is held",
      "type": ["string", "null"]
    },
    "organization": {
      "description": "The organization in which the post is held",
      "$ref": "http://popoloproject.com/schemas/organization.json#"
    },
    "start_date": {
      "description": "The date on which the post was created",
      "type": ["string", "null"],
      "pattern": "^[0-9]{4}(-[0-9]{2}){0,2}$"
    },
    "end_date": {
      "description": "The date on which the post was eliminated",
      "type": ["string", "null"],
      "pattern": "^[0-9]{4}(-[0-9]{2}){0,2}$"
    },
    "contact_details": {
      "description": "Means of contacting the holder of the post",
      "type": "array",
      "items": {
        "$ref": "http://popoloproject.com/schemas/contact_detail.json#"
      }
    },
    "links": {
      "description": "URLs to documents about the post",
      "type": "array",
      "items": {
        "$ref": "http://popoloproject.com/schemas/link.json#"
      }
    },
    "memberships": {
      "description": "The memberships through which people hold the post in the organization",
      "type": "array",
      "items": {
        "$ref": "http://popoloproject.com/schemas/membership.json#"
      }
    },
    "created_at": {
      "description": "The time at which the resource was created",
      "type": ["string", "null"],
      "format": "date-time"
    },
    "updated_at": {
      "description": "The time at which the resource was last modified",
      "type": ["string", "null"],
      "format": "date-time"
    },
    "sources": {
      "description": "URLs to documents from which the post is derived",
      "type": "array",
      "items": {
        "$ref": "http://popoloproject.com/schemas/link.json#"
      }
    }
  }
}