OnLine
Applied Information Studies
for PowerDesigner -
Expanding the Model
Enter "arrives at" as the predicate Label text for
"City" to "Flight".
Enter "is destination of" as the predicate Label text
for "Flight" to "City".
Every Flight must have some destination (at least we plan them that
way), so ...
Click the Mandatory radio button for "Flight" to
"City".
Does a flight have only one destination? Let's accept that, at least
initially ...
Click the One radio button for "City" to "Flight".
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© 1996 Applied Information Science International