{
  "globalConfig": {...},
  "attributes": {...},
  "entities": {...},
  "relations": {...},
  "appendAttribute": {            // all appendAttribute generators go here
    "append-twitter": {           // key for generator in appendAttributes, must be unique
      "data": [                   // files from which to load data
        "src/test/resources/1.0.0/phoneCalls/append-twitter-nickname.csv"
      ],
      "match": {
        "type": "person",                 // entity/relation type to append attributes to
        "ownerships": [                   // attribute(s) the entity/relation already has, ideally a key / something or 
                                          // combination that is uniquely identifying
          {
            "attribute": "phone-number",      // attribute type to match on
            "column": "phone_number"          // column from which to load values
          }
        ]
      },
      "insert": {
        "ownerships": [                         // attributes to append
          {
            "attribute": "twitter-username",    // attribute type to insert
            "column": "twitter",                // column from which to load values
            "listSeparator": "###",             // if column in a data file is a list of values, TypeDB Loader will split the list with the provided listSeparator and insert len(list) number of attributes
            "required": true                    // required defaults to false - if set to true, TypeDB Loader only inserts a data row if a value in this column exists and is of the correct type/can be cast
          },
          {
            "attribute": "nick-name",
            "column": "nick_name"
          }
        ]
      }
    },
    ...
  },
  ...
}