DFD is expressed using an intermediate language similar to the C language.
The images below are from the lecture notes passed out by Prof. Shubashish Dasgupta in September 2005. Please refer to http://www.marcoullis.com/KNOWLEDGE/SYSTEMS/marcoullisp_systems_process_modelling.html
The DFD diagrams are produced in Demarco and Yourdon standard, different from Gane and Sarson standard.
DFD context level diagram
DFD level 0 diagram 
DFD level 1 diagram
Sunday, July 22, 2007
DFD Example
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Nice notes..
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