Elements that support some kind of chapters or editions (or tracks like in the FLAC cue sheet) will implement this interface.
If you just want to retrieve the TOC in your application then all you need to do is watch for TOC messages on your pipeline's bus (or you
can perform TOC query). This interface is only for setting TOC data, not for extracting it. To set TOC from the application, find proper
tocsetter element and set TOC using set_toc.
Elements implementing the TocSetter interface can extend existing TOC by getting extend UID for that (you
can use find_entry to retrieve it) with any TOC entries received from downstream.