You define instance of objects using the object
object "My Second Object" as o2
Relations between objects
Relations between objects are defined using the following symbols :
It is possible to replace -- by .. to have a dotted line.
Knowing those rules, it is possible to draw the following drawings.
It is possible a add a label on the relation, using : followed by the text of the label.
For cardinality, you can use double-quotes "" on
each side of the relation.