schema.json

{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "foo": {
      "$ref": "#/definitions/Partial"
    },
    "bar": {
      "$ref": "#/definitions/Partial_1"
    }
  },
  "required": [
    "bar",
    "foo"
  ],
  "definitions": {
    "__type": {
      "additionalProperties": false,
      "type": "object",
      "properties": {
        "x": {
          "type": "number"
        },
        "y": {
          "type": "number"
        }
      }
    },
    "Partial": {
      "$ref": "#/definitions/__type"
    },
    "__type_1": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "a": {
          "type": "number"
        },
        "b": {
          "type": "number"
        }
      }
    },
    "Partial_1": {
      "$ref": "#/definitions/__type_1"
    }
  },
  "$schema": "http://json-schema.org/draft-07/schema#"
}