world/maps/
|
+---------------------oneworld/
		|
		+---------------------	index.xml
				0.0.0.xml
				1.0.0.xml
				2.0.0.xml
				0.0.1.xml
				0.0.2.xml
				-1.0.0.xml
				-2.0.0.xml
				-2.1.0.xml
				etc...

|
+----------------------twoworld/
		|
		+---------------------index.xml
				0.0.0.xml
				etc....


-------------------------------------------------------------------------
index.xml:
	region  0.0.0
			   x = -1      x = 0    x = +1
	neighbors	<-1.-1.-1> vector3df vector3df  z = -1
			vector3df vector3df vector3df  z = 0		y = -1
			vector3df vector3df vector3df  z = +1

			<-1.0.-1> vector3df vector3df  z = -1
			vector3df  <0.0.0> vector3df  z = 0		y = 0
			     ""       vector3df  <1.0.1>  z = +1

			vector3df vector3df vector3df  z = -1
			vector3df vector3df vector3df  z = 0		y = +1
			vector3df vector3df  <1.1.1>  z = +1

-----------------------------------------------------------------------------

0.0.0.xml
			node
			node
			node
			light
			node
			object
			object
			etc...

-----------------------------------------------------------------------------

1.0.0.xml
			node
			node
			node
			light
			node
			object
			object
			etc...

-----------------------------------------------------------------------------

-2000000000.0.-2000000999.xml
			node
			node
			node
			light
			node
			object
			object
			etc...

--------
notes:

index.xml:    a reference to a region "0.0.0" for example points to a file called 0.0.0.xml which stores all the content, nodes, objects etc
0.0.0.xml    a region file
neighbors:  a neighbor structure within the index specifies the neighbor regions as file name bases in an array of 27 string based vectors
"" would specify that a region is empty, no file exists for that region

at any one time a single array of 27 vectors indicating possible neighbors exists in memory, the central 0.0.0 representing the camera target location