anecdote
A short, simple narrative of an incident, often used for humerus effect.
argumentation
Writing that attempts to prove the validity of a point of view by presenting reasoned arguments.
allegory
An extended narrative in which characters, events, and settings represent abstract qualities and in which the writer intends a second meaning to read beneath the surface of the story.
annotation
Explanatory notes added to explain, cite sources, or give bibliographic data.