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 entity-relationship data model of the NDDN. Relationships among tables are shown with dotted lines. Entities are shown using boxed frames with their names labeled above. Primary keys are shown in the first row of the entity box. Foreign keys are labeled with (FK). The relationships between each table are shown with the dashed links between boxed frames.
