Abstract

Visual languages are receiving increased attention in the multimedia age, because the common user needs new ways to deal with multimedia information directly. A graphical user interface (GUI) can display only a limited number of icons simultaneously without cluttering the screen. The GUI icons are usually predefined. Visual language systems let the user introduce new icons and compose icons into visual sentences with different meanings, thus overcoming the GUI's limitations. This chapter extends the definition of visual languages to develop visual languages for tele-action objects. A Tele-Action Object (TAO) is a multimedia object with associated hypergraph structure and knowledge structure. The user can create and modify the private knowledge of a tele-action object, so that the tele-action object will automatically react to certain events to preperform operations for generating timely response, improving operational efficiency, and maintaining consistency. A tele-action object also possesses a hypergraph structure, supporting the effective presentation and efficient communication of multimedia information.

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