Using Canviz has advantages for your web application over generating and sending bitmapped images and imagemaps to the browser as the server only needs to have Graphviz generate xdot text; this is faster than generating bitmapped images. Also only the xdot text needs to be transferred to the browser; this is smaller than binary image data, and, if the browser supports it (which most do), the text can be gzip- or bzip2-compressed.
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