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 CDA model allows any stretch of text (e.g. a phrase) to be marked by a content tag (here identified as A, B and C), which may be nested to any depth (B contains a stretch of text B1). Following the text, one or more entry elements are used to define concepts and link them back to the marked items using these identifiers (references indicated by arrows).
