json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "properties": {
          "description": {
              "description": "A short description of the population",
              "type": "string"
          },
          "id": {
              "description": "Integer data. Ex: 2673",
              "type": "integer"
          },
          "level": {
              "description": "Whether the item is a single individual, or a population",
              "enum": [
                  "individual",
                  "population"
              ],
              "type": "string"
          },
          "name": {
              "description": "A name for the item, useful to identify it later",
              "type": "string"
          },
          "owner": {
              "description": "A single related resource. Can be either a URI or set of nested resource data.",
              "type": "string"
          },
          "resource_uri": {
              "description": "Unicode string data. Ex: \"Hello World\"",
              "type": "string"
          },
          "size": {
              "description": "If the item is a population, the number of individuals or biomass",
              "type": "number"
          },
          "taxa": {
              "description": "The identifier (or URI) of the taxa object to which the item belongs.",
              "type": "string"
          },
          "traits": {
              "description": "A list of traits values indentifiers (or URIs) that were measured on this item.",
              "items": {
                  "type": "string"
              },
              "type": "array"
          },
          "units": {
              "description": "Units in which the population size is measured",
              "type": "string"
          }
      },
      "required": [
          "level",
          "taxa",
          "name",
          "owner"
      ],
      "title": "Schema for item objects",
      "type": "object"
  }