Generated JSON Schema does not enforce root element

[david-waltermire]

The toolchains/oscal-m2 implementation does not properly generate a JSON schema.

A current generated schema looks like this:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  ... snip ...
  "type": "object",
  "definitions": {
    "parent": {
      ... snip ...
    }
  },
  "properties": {
    "parent": {"$ref": "#/definitions/parent"}
    }
  }
}

But it's missing a definition of the required properties for the root object.

The following illustrates the addition of a "required" property at the end to fix this.

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  ... snip ...
  "type": "object",
  "definitions": {
    "parent": {
      ... snip ...
    }
  },
  "properties": {
    "parent": {"$ref": "#/definitions/parent"}
    }
  },
  "required": [ "parent" ]
}

Unit tests that illustrate this bug are included in PR #10, which has been integrated into master.

[wendellpiez]

See the PR at #13

[wendellpiez]

This is now working. Additionally, at the top we have

"additionalProperties" : false,
"maxProperties" : 1

which forces only a single, designated property at the root, and nothing else.