Symanzik, Juergen and Baker, Albert L. (1997) Non-Atomic components of Data Flow Diagrams: Stores, Persistent Flows, and Tests for Empty Flows. Technical Report TR96-21, Department of Computer Science, Iowa State University.
Non-Atomic Components of Data Flow Diagrams:
Stores, Persistent Flows, and Tests for Empty Flows
Juergen Symanzik and Albert L. Baker
It has been shown in Symanzik and Baker (1996a) that a particular
subclass of Formalized Data Flow Diagrams (FDFD's) is Turing equivalent.
We call this Turing equivalent subclass of FDFD's persistent flow--free
Reduced Data Flow Diagrams (PFF--RDFD's). PFF--RDFD's do not contain
persistent flows, reference only values whose types have finite domains,
and have enabling conditions that contain no tests for empty flows.
In addition, FDFD's do not contain (direct) representations of stores.
This raises the question whether any of these common features
of traditional Data Flow Diagrams elevates the expressive power of FDFD's,
or whether the various subclasses have the same expressive power as
FDFD's with these features.
This paper addresses this issue of whether persistent flows, arbitrary
domains, tests for empty flows or stores are essential features
with respect to the expressive power of Formalized Data Flow Diagrams.
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