Resource loader that supports generation data groups (GDG) with the "gdg:" URI protocol. Other URIs or paths without protocol are delegated to ResourceLoader. Generation data groups are supported with the following syntax: gdg:path/to/file(<number>)[.<extension>] <number> refers to a file in the group. The latest version existing before the job is start is version 0. The previous one is -1, and so on. The version that has being written in the current job can be referenced with 1 (or +1). It is possible to limit the number of files in a group by using a setting named "gdg-options". This setting must be a string containing comma separated values with the following repeatable pattern: path/to/file.txt,limit=<limit>[,mode=<mode>] <limit> is the maximum number of files in the group and <mode> is either "empty" or "noempty". If no mode is specified, "noempty" is the default. In the "empty" mode, all previous files are moved when the limit is reached, whereas in "noempty" mode the oldest files are removed to keep the number of files at the limit.