private Struct getDotted(String key) {
    String[] parts = key.split("(\\[])?\\.", 2);
    if (parts.length == 2) {
      return getStruct(parts[0]).get(parts[1]);
    }
    return getStruct(parts[0]);
  }
The key/value pairs on this element.
planetiler-core/src/main/java/com/onthegomap/planetiler/reader/WithTags.java