/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/mediacenter/elements/qmldir is in plasma-mediacenter 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | CategoriesBar 2.0 categoriesbar/CategoriesBar.qml
MediaBrowser 2.0 mediabrowser/MediaBrowser.qml
MediaPlayer 2.0 mediaplayer/MediaPlayer.qml
MediaController 2.0 mediacontroller/MediaController.qml
Playlist 2.0 playlist/Playlist.qml
ImageViewer 2.0 imageviewer/ImageViewer.qml
PopupMenu 2.0 popupmenu/PopupMenu.qml
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