Need option to produce non-flattened schemas (cannot currently handle tree structures)

[rage-shadowman]

Currently, shapeshifter generates flattened schemas which cannot define anything with a self reference (such as a tree structure, where a "Branch" may contain other "Branch" objects as well as "Leaf" objects).

However, JSON Schema allows for self referencing schemas via "$ref" property:

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Tree",
  "oneOf": [ {
      "$ref": "#/definitions/Leaf"
    }, {
      "$ref": "#/definitions/Branch"
    }
  ],
  "definitions": {
    "Leaf": {
      "title": "Leaf",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "name": {
          "type": "string"
        }
      },
      "required": [ "name" ]
    },
    "Branch": {
      "title": "Branch",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "name": { "type": "string" },
        "nodes": {
          "type": "array",
          "items": {
            "oneOf": [ {
                "$ref": "#/definitions/Leaf"
              }, {
                "$ref": "#/definitions/Branch"
              }
            ]
          }
        }
      },
      "required": [ "name" ]
    }
  }
}

It would be nice if we could somehow tell shapeshifter to generate reference-based schemas instead of flattened schemas in order to accommodate such structures.