Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/tabletorule.man

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+.TH tabletorule "" "" "/rdb Command"
+.PC "Convert a table to PROLOG rule-file format"
+\fBtabletorule \fItable ... \fB> \fIprologrulefile\fR
+.PP
+.II "table^convert to PROLOG rules"
+.II "PROLOG^convert table to rules"
+The command
+.B tabletorule
+converts each
+.I table
+into a file of rules in predicate-calculus implication form
+that can be input to a PROLOG interpreter.
+.PP
+PROLOG rules are in the form:
+.DS
+.I
+	relationship(X,Y) :- class(X), relationship(X,Y).
+.DE
+.PP
+For example
+.DM
+	mother(X,Y) :- female(X), parent(X,Y).
+.DE
+.PP
+means that ``X is the mother of Y, if X is female and X is the parent of Y.''
+.PP
+PROLOG is a programming language used for artificial-intelligence applications.
+Its name is a contraction of the phrase
+.I "programming in logic."
+Input to PROLOG consists of
+.IR facts ,
+.IR rules ,
+and
+.IR questions .
+If you build a data base of facts and rules, you can ask questions
+and get answers.
+If a question you ask does not have a
+corresponding fact in the data base,
+PROLOG will look through its rule file to see if other facts might
+logically deduce the fact requested.
+.SH Example
+Suppose we have the simple table
+.B parent
+.DM
+Parent  Child
+------- -------
+Sally   Fred
+Mike    Fred
+Fred    Jane
+.DE
+.PP
+the simple table
+.B female
+.DM
+Name
+----
+Jane
+Sally
+.DE
+.PP
+the simple table
+.B male
+.DM
+Name
+----
+Fred
+Mike
+.DE
+.PP
+and the simple table
+.BR ruletable :
+.DM
+True         If
+-----------  -------------------------
+mother(X,Y)  female(X), parent(X,Y)
+.DE
+.PP
+The command
+.DM
+	tabletorule ruletable > rule
+.DE
+.PP
+writes the following into file
+.BR rule :
+.DM
+	mother(X,Y) :- female(X), parent(X,Y).
+.DE
+.PP
+Now PROLOG can use its
+.B consult
+command to read
+.BR rule .
+It could then answer questions like:
+.DM
+	mother(sally,fred)?
+.DE
+.SH "See Also"
+.B
+tabletofact
+.R
+.SH Notes
+.II COHware
+If you wish to experiment with PROLOG,
+volume 2 of
+.B COHware
+includes the source code for a PROLOG interpreter.