George,
Multiplicity indicates how many instances of a class can be associated with
one instance of another class. For instance (pun intended) class Person is
related to class Company. On the Company end of the relationship, the role
is employer. If the multiplicity is 1..*, it means that a person in our
system must be related to at least one business as his/her employer and that
the person can have multiple employers. The * means "many" and we read 1..*
as "one to many". From this, you can deduce that 0..* means "zero or more".
If we used it in our example, it would mean that we could have a person in
our system who is unemployed. The notation of * means the same as 0..*.
HTH,
cve
Cindy VanEpps
Software Engineering Specialist
Rational Software
[EMAIL PROTECTED]
281.648.7996
http://www.rational.com
"Complexity is just a disarrangement of simplicities."
-----Original Message-----
From: george brown [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 21, 2000 5:26 PM
To: [EMAIL PROTECTED]
Subject: (ROSE) * Cardinality
Hi,
I couldn't find any info on the following in the UML user guide. Could
someone explain that to me, please?
What is the difference between a multiplicity of (1..*) or (0..*) and (*)?
What does exactly a (*) cardinality mean?
Thanks,
George
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