Because it is a very common combination, the cardinality “must be one and only one”, which should appear as “1..1” is collapsed into the single symbol “1” in UML modeling tools. This is unfortunate, since the two components form the two parts of the natural language sentence describing the predicate. If at all possible, adjust the tool to make all of these appear as “1..1”.[(]
To draw an architectural entity/relationship model, using the UML notation, follow these steps:
1. Show domain-specific entity classes only.
2. Use symbols selectively.
Ø Use only recommended symbols.
Ø Optionally, use selected UML symbols not available normally to entity/relationship modeling.
Ø Do not use UML design-oriented ...