An activity that helps achieve a goal.
This represents any contribution an Agent makes to a Project, Event, or a Document. The particular ways of contributing are represented by the linked Contribution Statements.
Just those of Activity.
Beside those inherited from Activity:
has-contribution-statement / references : A Contribution can have any number of Contribution Statements.
is-testified-by / testify : A Contribution can be testified by any number of Acknowledgement Statements.