Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The data model is depicted as a class diagram in the Unified Modeling Language (http://www.uml.org). Some details of the model are ignored to reduce the complexity of the diagram.
