returns the unique identifier of the sequence . concode_field_sep long createdAt concode_elem_sep List<MapillaryAbstractImage> images concode_elem_sep String key concode_field_sep void add concode_elem_sep void add concode_elem_sep MapillaryAbstractImage next concode_elem_sep long getCreatedAt concode_elem_sep MapillaryAbstractImage previous concode_elem_sep void remove concode_elem_sep List<MapillaryAbstractImage> getImages
String function ( ) { return this . key ; }