A class diagram:
Class diagram describes the business world have to do what elements and these elements are;
Second, the timing diagram:
The timing diagram describes the operating rules of the business world (fragment); timing nodes in the graph as a class or object, according to the rules of running a contact.
Note that a plurality of other classes may be classes reference (link occurs), so the node o'clock, arrows point may be a plurality of other nodes;
Third, the inheritance graph
Each node in the class diagram and a timing chart of a parent node may have been or abstract node;
The abstract node and a parent node itself constitutes inheritance hierarchy;
These structures are anchored to the structural diagram and a timing chart of the class, the class diagram and a timing chart of the structure constitutes a two-dimensional and multi-dimensional structure;
Fourth, the function of viewing angle: state context.
Each class is a set of functions or a running state of the package context;
Each of the modifications and the maintenance operations in this state, ready to provide context for subsequent operations.