The Vishnu Purana is an exception in that it presents its contents in Vishnu worship-related Pancalaksana format - Sarga (cosmogony), Pratisarga (cosmology), Vamśa (mythical genealogy of the gods, sages and kings), Manvañtara (cosmic cycles), and Vamśānucaritam (legends during the times of various kings). This is rare, state Dimmitt and van Buitenen, because just 2% of the known Puranic literature corpus is about these five Pancalaksana items, and about 98% is about diverse range of encyclopedic topics.