XAPIVerb:
| "answered"
| "asked"
| "attempted"
| "attended"
| "commented"
| "completed"
| "exited"
| "experienced"
| "failed"
| "imported"
| "initialized"
| "interacted"
| "launched"
| "mastered"
| "passed"
| "preferred"
| "progressed"
| "registered"
| "responded"
| "resumed"
| "scored"
| "shared"
| "suspended"
| "terminated"
| "voided"
| "downloaded"
| "copied"
| "accessed-reuse"
| "accessed-embed"
| "accessed-copyright"