Abstract
The ability for users online creating and editing mathematical expressions is very important for Science Computing Systems, Science Communication Systems, and Web-based Mathematics Education Systems. Lanzhou university/China and Kent University/USA are jointly developing a mathematical expression editor. The editor MathEdit, implemented in JavaScript and MathML, is a web-based visual interactive editor for mathematical expressions. Figure 1 shows the end-user view of the MathEdit architecture. In MathEdit the MathML Content code is the core code of being edited mathematical expression. User actions, inserting, deleting and editing sub-expressions by mouse clicks and keyboard input, are treated as commands. The commands will invoke JavaScript functions in the command processing module to modify the MathML content code by revising DOM tree of expression. The MathML Content will synchronously convert to MathML Presentation code and Math Infix code. The user will intuitively see the changed math expression displayed by MathML Presentation.
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