General Levels and Population attributes (tables)

Hi ,

I have following 4 questions related to general levels and population attributes.

1. I would like to understand the purpose and usage of general level attributes in Demantra. I tried to understand this from the implementation guide, but I see only brief mention of them which is not giving complete idea on what they are meant for and how they integrate with item/location levels (hierarchies).
2. Also want to understand the tables listed in the population attributes (based on attribute name, Demantra creates the table names), would like to understand importance of each table and the interrelationship among themselves and item/location tables.