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.
Logical schema of the metadata repository. Red relations represent FKs between core schema tables; blue relations link core schema values to corresponding ontology vocabulary terms. Data types are shortened: str for character varying; int for integer; and bool for Boolean. N marks nullable attributes.
