  OBJ EVT ROLE PERF-ATT LEVEL) means that the individual OBJ
            plays the role ROLE in the action EVT, and does so with the
            performance attribute PERF-ATT to the degree LEVEL. Such an
            assertion expresses actual performance in a particular
            action; for example, <a
            href="./doing-vocab.html#performanceLevel">(#$performanceLevel</a>
            Joe DiggingHole54001 <a
            href="./actor-vocab.html#performedBy">#$performedBy</a>
            #$Strengt