{
  "$id": "https://example.com/properties.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "oneOf": [
    {
      "required": [
        "requiredprop"
      ],
      "properties": {
        "requiredprop": {
          "type": "string"
        }
      }
    },
    {
      "properties": {
        "forbiddenprop": {
          "type": "null"
        }
      }
    }
  ]
}