diff --git a/doc/feindesign/server_architektur.rs b/doc/feindesign/server_architektur.rs
new file mode 100644
index 0000000..25572a8
--- /dev/null
+++ b/doc/feindesign/server_architektur.rs
@@ -0,0 +1,170 @@
+// main author: Robin Willmann
+// date : see git.
+
+
+// WIP, changes welcome
+
+mod model {
+    pub struct Sha256(pub [64;u8]);
+    
+    pub struct Texture {
+        pub id : String,
+        pub name : String,
+        pub tags : Vec<String>,
+        pub format : TextureFormat,
+        pub resolution : (usize, usize),
+        pub texture_hash : Sha256
+    }
+    
+    pub enum TextureFormat {
+        PNG,
+        JPG
+    }
+}
+
+mod protocol {
+    use crate::model::*;
+    
+    pub enum ReplaceTextureStatus {
+        // Call Again With Texture Binary
+        NeedTextureData,
+        // Done.
+        Ok,
+    }
+    
+    pub type ProtocolResult<T> = Result<T, NetworkError>;
+    pub enum ProtocolError {
+        BadRequest(pub String),
+        FileNotFound(pub String),
+        Conflict(pub String),
+        InternalServerError(pub std::io::Error),
+        NotImplemented,
+    }
+    
+    pub trait ProtocolHandler : Send + Sync {
+        fn query(mut self, &[String]) ->  
+            ProtocolError<Vec<Texture>>;
+        
+        fn get_texture_by_id(mut self, id : String) ->          
+            ProtocolError<Option<Texture>>;
+            
+        fn get_texture_by_name(mut self, id : String) -> 
+            ProtocolError<Option<Texture>>;
+            
+        fn get_texture_file(mut self, hash : Sha256) -> 
+            ProtocolError<Vec<u8>>;
+        
+        fn get_texture_preview(mut self, hash : Sha256) -> 
+            ProtocolError<Vec<u8>>;
+        
+        fn replace_texture(mut self, 
+                delete : Option<Texture>, 
+                insert : Option<Texture>,
+                insert_texture_data : Option<Vec<u8>>
+            )  -> ProtocolError<ReplaceTextureStatus>;
+    }
+    
+    pub struct ProtocolConfig {
+        pub port : u16,
+    }
+    
+    pub fn listen_forever(handler : &ProtocolHandler) -> {
+        unimplemend!()
+    }
+}
+
+mod persistency {
+
+    use std::io;
+    
+    pub struct DataStore {
+        // private attributes
+    }
+    
+    impl DataStore {
+        pub fn new(path : Path) -> io::Result<DataStore> {
+            unimplemend!()
+        }
+        
+        pub fn garbage_collect() -> io::Result<()> {
+            unimplemend!()
+        }
+        
+        // TODO: think
+    }
+    
+    mod search {
+        use crate::model::*;
+        
+        pub struct Query {
+            filters : Vec<QueryFilterModifier>,
+        }
+        
+        pub type QueryParserResult<T> =  Result<Query, QuerySyntaxError>;
+        pub enum QuerySyntaxError {
+            UnknownFilter,
+        }
+        
+        impl Query {
+            pub fn parse(input : &[String]) -> QueryParserResult{
+                unimplemend!()
+            }
+        }
+        
+        pub fn search(input : &[Texture], query : &Query) -> Vec<Texture> {
+        
+        }
+        
+        //private
+        enum QueryFilterModifier{
+            None(QueryFilter),
+            Not(QueryFilter),
+        }
+        
+        //private
+        enum QueryFilter {
+            TagName(String),
+            InName(String),
+            MinResolution(usize),
+            BeforeDate {
+                year : u16,
+                month : u16,
+                day   : u16,
+            }
+        }
+    }
+   
+}
+
+mod image_convert {
+    use crate::model::*;
+    
+    pub struct ConvertConfig {
+        pub desired_size : (usize, usize),
+    }
+    
+    pub generate_preview(
+        input  : Vec<u8>,
+        format : Format
+        config : ConvertConfig,
+    ) -> ::image::ImageResult<Vec<u8>>;
+}
+
+
+mod main {
+
+    struct ServerState {
+        // private attributes
+    }
+    
+    impl ProtocolHandler for ServerState {
+        // ....
+    }
+    
+    
+    pub fn main(){
+         unimplemend!()
+    }
+    
+    
+}