Probably two internal MB tags have to be implemented indicating that a track is a continuation of another one and will be continued by third one. That's easy, I believe.
However, what will happen if one interim track is filtered out or even deleted? Maybe every track in the sequence should contain information for all other tracks? Something like chapters for internal use of MB? But, in that case, if a track is renamed, the respective "chapters" changes in all related tracks have to be managed automatically by MB?
Later, let's assume that choosing one track from the sequence put all other related tracks in the playlist. Should it be possible to skip between the tracks in the sequence (treated like separate chapters)? I believe so, otherwise we could have really loooong playing songs?