Hierarchy of schemata

[saraedum]

@DunklesArchipel and I had a discussion about inheritance of schemata.

The easiest seems to add more fields to an existing schema by doing something like this:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Extending an existing schema",
  "allOf": [
    {
      "$ref": "original-schema.json"
    },
    {
      "properties": {
        "newProperty": {
          "type": "string"
        }
      },
      "required": ["newProperty"]
    }
  ]
}

Eventually, there should be a full hierarchy of schemata that just mix and match things as needed.