The document discusses various codes and conventions that are commonly used in film opening sequences. It begins by explaining the purpose of an opening sequence is to introduce the genre, setting, mood, and other elements. It then lists and describes different compositional and graphical elements that may be included, such as studio logos, titles, establishing the genre, character introductions, narration, sounds, credits, flashbacks, establishing shots, action scenes, and animation. Specific film examples are provided to illustrate several of these elements.