{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://spec.soustack.org/defs/quantity.schema.json",
  "title": "Quantity",
  "type": "object",
  "properties": {
    "amount": { "type": "number" },
    "unit": { "type": "string", "minLength": 1 },
    "metadata": { "type": "object", "additionalProperties": true }
  },
  "required": ["amount", "unit"],
  "additionalProperties": false,
  "patternProperties": {
    "^x-": { "$ref": "./common.schema.json#/properties/extensionLaneValue" }
  }
}