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 SQWRL query to calculate length of line from (x,y) coordinates and pixel spacing information, with results shown in the panel below. The length is shown in the last column in the lower panel. An equivalent SWRL rule is used to assert these lengths into an OWL knowledge base for further reasoning.
