json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "name": {
              "type": "string"
          },
          "created": {},
          "modified": {},
          "type": {
              "type": "string"
          },
          "mimetype": {
              "type": "string"
          },
          "size": {
              "type": "integer"
          },
          "hash": {
              "type": "string"
          },
          "modality": {
              "type": "string"
          },
          "measurements": {
              "items": {
                  "type": "string"
              },
              "type": "array",
              "_uniqueItems": true
          },
          "tags": {
              "items": {
                  "type": "string"
              },
              "type": "array",
              "_uniqueItems": true
          },
          "info": {
              "type": "object"
          }
      },
      "required": [
          "name",
          "created",
          "modified",
          "size",
          "hash"
      ],
      "key_fields": [
          "name"
      ],
      "additionalProperties": false
  }