An official website of the United States government
Here's how you know
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.
DBin: The class and instance hierarchy is on the left and the panel on the right enables users to annotate resources. DBin allows users to create domain specific user interfaces and this figure shows one such possible user interface