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.
Example schema diagram from the NBDC RDF portal. This example schema diagram is taken from the RefEx RDF. The orange, yellow and pink rectangles represent instances, ontology classes and literals, respectively; the solid and dashed arrows represent properties and rdf:type relationships; the dotted circles represent blank nodes.
