"A desktop event: activity performed by an user. A "hook" class that should be extended by other ontologies such as desktop service ontology to specify which application or service was involved in the desktop event."
"An event of primary or intended use of the resource by the user. Primary or intended use is defined as the use by the consumer of the resource, such as watching a movie or listening to a song. Not to be confused with a low-level read on a file."
"The total amount of time a resource was in focus during a UsageEvent. This property should be used to 'compress' several FocusEvent instances into the essential information."
