+ The following fields should only be used when the video belongs to some logical
+ chapter or section:
+
+ chapter: Name or title of the chapter the video belongs to.
+ chapter_number: Number of the chapter the video belongs to, as an integer.
+ chapter_id: Id of the chapter the video belongs to, as a unicode string.
+
+ The following fields should only be used when the video is an episode of some
+ series or programme:
+
+ series: Title of the series or programme the video episode belongs to.
+ season: Title of the season the video episode belongs to.
+ season_number: Number of the season the video episode belongs to, as an integer.
+ season_id: Id of the season the video episode belongs to, as a unicode string.
+ episode: Title of the video episode. Unlike mandatory video title field,
+ this field should denote the exact title of the video episode
+ without any kind of decoration.
+ episode_number: Number of the video episode within a season, as an integer.
+ episode_id: Id of the video episode, as a unicode string.
+