RJSVM/node_modules/ripple-lib/dist/npm/common/schemas/specifications/settings.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "settings",
  "link": "settings",
  "$ref": "settingsPlusMemos",
  "oneOf": [
    {
      "required": ["memos"],
      "minProperties": 2,
      "maxProperties": 2
    },
    {
      "not": {
        "required": ["memos"]
      },
      "minProperties": 1,
      "maxProperties": 1
    }
  ]
}