= Storage File Format
I see little reason to deviate too much from Notch's region file format.  Each region file would persist a logical unit of world of a fixed size (e.g. 64 x 64 x 64 blocks).  Each file contains several channels:
* Blocks
* Lighting
* Graphs
* Entities
* Items

== Blocks
The block channel consists of an array of ordinals, each identifies the block-type as well as its meta-configuration

== Lighting
The lighting channel indicates light levels and light colour

== Graphs
Graphs are arbitrary networks of information that can span arbitrary distances that typically relate to specific types of blocks, one such example of a graph is the steam engine assembly in Mad Martian Mod.

== Entities
All movable objects and creatures other than players

== Items
Items that are left lying around on the ground, unlike Minecraft, Revenant will treat these differently and not lump them into the same category as entities.