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Data flow notation shows a visual program as a directed graph of blocks
and links. links show the flow of the data. and blocks represent
operations on the data.
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Extending data flow notation to support iterative and conditional control
flow is relatively simple. Both these control constructs use data in their
conditions, so they require only small extensions to the inteface.
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Extending data flow notation to support sequential control flow is more
difficult as there is no data dependency.
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Several techniques have been used to make this extension. All of these
techniques increase the complexity of notaion.
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