Figure 4.
HTN domain model. The domain was modelled in the form of a hierarchical task network where an abstract goal is broken down into a number of executable steps. The leaf nodes correspond to individual executable web services.
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.