1012 
'Ecosytcm_Process 
Figure 2. Class Interaction Diagram for an Object-Oriented Modeling Framework. Arrows point from more 
specialized subclasses to their more general parent classes. Double lines show where members of class marked 
with solid circle contain members of another class, or members of a class marked with an open circle use 
members of another class to provide part of their behavior. Cardinality labels indicate whether a relationship is 
one-to-one, one-to-many, many-to-many, and so on.