Where is SegmentTimelineType, et al

[TheWizz]

Where can I find the following files, imported into DashFragmentedMp4Writer? They're not in the project as far as I can see, nor found through the Maven dependencies.

-JM

import mpeg.dash.schema.mpd._2011.RepresentationType;
import mpeg.dash.schema.mpd._2011.SegmentTemplateType;
import mpeg.dash.schema.mpd._2011.SegmentTimelineType;