2 
 
 
3 


4 
 If no cardinality is defined on an attribute it is assumed to be "1" 
 If no cardinality is defined on an attribute it is assumed to be "1" 
5 

Motivation: ... 
6 

 
7 


8 


9 


10 
 If no cardinality is defined on a collection it is assumed to be "*" 
 If no cardinality is defined on a collection it is assumed to be "*" 
11 

Motivation: ... 
12 

 
13 


14 
 If no cardinality is defined on a reference it is assumed to be "1" 
 If no cardinality is defined on a reference it is assumed to be "1" 
15 

Motivation: ... 
16 

 
17 

