{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.govfresh.com/v1/budget/amount.schema.json",
  "title": "Amount",
  "description": "A sum of money, as a schema:MonetaryAmount. Currency is required on every amount rather than inherited from the budget, because amounts get copied out of their document and a figure that silently assumes a currency is how conversion errors happen.",
  "type": "object",
  "properties": {
    "@type": {
      "const": "MonetaryAmount",
      "description": "Always `MonetaryAmount`, a real schema.org type."
    },
    "value": {
      "type": "number",
      "description": "The numeric amount, in the units `currency` names."
    },
    "currency": {
      "type": "string",
      "pattern": "^[A-Z]{3}$",
      "description": "ISO 4217."
    },
    "validFrom": {
      "type": "string",
      "format": "date",
      "description": "When this amount takes effect, for a value that changes over time."
    },
    "validThrough": {
      "type": "string",
      "format": "date",
      "description": "When this amount stops applying."
    }
  },
  "required": [
    "@type",
    "value",
    "currency"
  ],
  "additionalProperties": false
}