{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "$id": "https://example.com/product.schema.json",
  "title": "Form",
  "description": "A form",
  "type": "object",
  "required": ["form_type", "start_year", "end_year", "sections"],
  "properties": {
    "form_type": {
      "description": "",
      "type": "string"
    },
    "start_year": {
      "description": "",
      "type": "integer"
    },
    "end_year": {
      "description": "",
      "type": "integer"
    },
    "sections": {
      "type": "object",
      "patternProperties": {
        "^[0-9]+$": {
          "description": "",
          "type": "string"
        },
        "properties": {
          "label": {
            "description": "",
            "type": "string"  
          },
          "subsections": {
            "description": "",
            "type": "object",
            "patternProperties": {
              "^[0-9]+$": {
                "description": "",
                "type": "object",
                "required": ["label"],
                "properties": {
                  "label": {
                    "description": "",
                    "type": "string"  
                  },
                  "pages": {
                    "type": "object",
                    "required": ["header"],
                    "patternProperties": {
                      "^[0-9]+$": {
                        "properties": {
                          "header": {
                            "description": "",
                            "type": "string"  
                          },
                          "description": {
                            "description": "",
                            "type": "string"  
                          },
                          "questions": {
                            "type": "object",
                            "properties": {
                              
                            }
                          }
                        }
                      }
                    }
                  }
                }
              },      
              "additionalProperties": false,
              "maxProperties": 1,
              "minProperties": 1
            }
          }
        }
      }
    }
  }
}