Currently FrameNet does not contain frames that would be appropriate for the words "Liberalisierung" and "Öffnung" of this sentence. So both words have been assigned an "Unknown" frame. Still the core frame element present has been marked as Fe1.
The frame "Process_continue" is being evoked by the words "schreiten voran". As there is no single node of the syntactic structure that covers these words, the edge for the frame-evoking element is split.