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The Graphviz de design programs takes description of graphics in a simple text language, and and make diagrams in useful formats, such as images and SVG for web pages, PDF or PostScript for its inclusion in other documents; or visualize in a interactive graphic browser. (Graphviz also admits GXL, a XML dialogue).
Graphviz has several useful features for the diagramsm as the colour options, fonts, table nodes designs, line styles, hyperlinks, Rolland custom shapes.
According to the OS the dot is i the following paths. WINDOWS: dll/dot-w2k/dot.exe UNIX : /usr/bin/dot