Figure 3.
The advanced search query interface allows ontological expansion and synonym selection for query terms. The results of the NIF Web are ranked by a number of criteria including both content and recency of documents.
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.