Chapter 3: Mobile Personal Content Uncovered 55 basic types (like saved games), we would need to include an additional category, such as other, which would then include all types that do not fi t within the basic types: • other: saved games, skins, bookmarks, presence information, game characters, etc. This is content that is not in textual (since it is not in the text category) but in binary format. The content may still consist of alphanumeric characters only (such as bookmarks); however, they are not meant to be read directly. The way the bits are to be interpreted is not obvious and cannot be determined by the category. Obviously, an alternative is to add a new category for each new content type. This would not be categorization, however, but a plain list of all potential content types. The categorization is technical by nature, as bits and internal rep- resentations are involved. A more human approach would be to look at the list above and consider the function of the content: is it meant to be read, viewed, or listened to? This might allow us to include new categories: is it meant to be played (game-related personal content would be included here); is it meant to convey your personal tastes (skins, presence information)? This might be a fruitful approach, so let us try to re-formulate the list: • for reading: SMS, e-mail, e-book, chat session log; • for viewing: photos, scanned paintings, videos, game movies; • for listening: music, ring tones, earcons; • for playing: saved games, game characters, high scores; • for expressing personality: skins, profi les, presence information; • for analyzing: personal health information; • for navigation: bookmarks, maps, landmarks. Categorizing content by its function takes us further, since the impor- tance or meaningfulness of content without function is to be doubted. However, there are still borderline cases, such as with bookmarks used for navigating. However, they also provide access to content with any function. What is important here is that bookmarks are your personal pointers to (in many cases) non-personal content. It is important to note that the categories described above form only a small subset of all available content functions. Obviously, any action that can be performed with a computing device can potentially contain respective personal content types.