diff --git a/src/bot.rs b/src/bot.rs
index c90b823..cd23d82 100644
--- a/src/bot.rs
+++ b/src/bot.rs
@@ -1,5 +1,5 @@
 pub enum Error{
-	
+	InvalidSegment,
 }
 
 /* block types
@@ -28,6 +28,23 @@ loop{
 
 */
 
-pub struct Bot{
-	//
+struct SegmentId(u64);
+
+pub struct Segment{
+	state:simulation::State,
+	instructions:Vec<instruction::TimedInstruction<simulation::Instruction>>
+}
+
+pub struct StreamableBot{
+	file:crate::file::File,
+	timeline:timeline::Timeline<SegmentId>,
+}
+impl StreamableBot{
+	pub fn load_segment(&mut self,segment_id:u64)->Result<Segment,Error>{
+		//load region from disk
+		//parse the models and determine what resources need to be loaded
+		//load resources into self.resources
+		//return Region
+		Err(Error::InvalidSegment)
+	}
 }
\ No newline at end of file
diff --git a/src/demo.rs b/src/demo.rs
index c2d30d4..ea66dc5 100644
--- a/src/demo.rs
+++ b/src/demo.rs
@@ -1,13 +1,23 @@
 pub enum Error{
-	
+	//
 }
 
 /*
 BLOCK_DEMO_HEADER:
-//timeline of loading maps, bots
+u128 map_resource_id
+u64 map_header_block_id
+u32 num_bots
+for bot_id in 0..num_bots{
+	u128 bot_resource_id
+	u64 bot_header_block_id
+}
+
+//bot loading timeline
+how to do worldstate for deathrun!?
+
 */
 
-pub struct Demo{
-	map:Box<crate::map::Map>,
-	bots:Vec<crate::bot::Bot>,
+pub struct StreamableDemo{
+	map:Box<crate::map::StreamableMap>,
+	bots:Vec<crate::bot::StreamableBot>,
 }
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 01caa08..e36ef03 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,9 +13,9 @@ pub enum Error{
 }
 
 pub enum SNF{
-	Map(map::Map),
-	Bot(bot::Bot),
-	Demo(demo::Demo),
+	Map(map::StreamableMap),
+	Bot(bot::StreamableBot),
+	Demo(demo::StreamableDemo),
 }
 
 pub fn read<R:Read>(input:R)->Result<SNF,Error>{
diff --git a/src/map.rs b/src/map.rs
index df2d59b..e4fc21f 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -1,5 +1,5 @@
 pub enum Error{
-	
+	InvalidNode,
 }
 
 /* block types
@@ -46,6 +46,28 @@ for model_id in 0..num_models{
 
 */
 
-pub struct Map{
+struct Uuid(u128);
+struct BvhNodeId(u64);
+struct BvhNode{
 	//
+}
+enum Resource{
+	IndexedModel(model::IndexedModel),
+	Image(image::Image),//?
+}
+
+pub struct StreamableMap{
+	file:crate::file::File,
+	style:physics::StyleModifiers,//probably should move this out of physics
+	bvh:BvhNode,
+	resources:std::collections::HashMap<Uuid,Resource>,
+}
+impl StreamableMap{
+	pub fn load_node(&mut self,node_id:BvhNodeId)->Result<Vec<model::ModelInstance>,Error>{
+		//load region from disk
+		//parse the models and determine what resources need to be loaded
+		//load resources into self.resources
+		//return Region
+		Err(Error::InvalidNode)
+	}
 }
\ No newline at end of file