diff --git a/Cargo.lock b/Cargo.lock
index b134b8e..53b22b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -79,6 +79,7 @@ name = "mist"
 version = "0.1.0"
 dependencies = [
  "parser",
+ "semantic",
  "serde",
  "serde_json",
 ]
@@ -154,6 +155,10 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "semantic"
+version = "0.1.0"
+
 [[package]]
 name = "serde"
 version = "1.0.228"
diff --git a/Cargo.toml b/Cargo.toml
index 9afc151..2a9e8f2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2024"
 serde = { version = "1.0.228", features = ["serde_derive"] }
 serde_json = "1.0.149"
 parser = { path = "./parser" }
+semantic = { path = "./semantic" }
diff --git a/semantic/src/lib.rs b/semantic/src/lib.rs
index b93cf3f..b4ef974 100644
--- a/semantic/src/lib.rs
+++ b/semantic/src/lib.rs
@@ -1,14 +1,3 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
+pub mod top_level;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub struct Scope {}
diff --git a/semantic/src/top_level.rs b/semantic/src/top_level.rs
new file mode 100644
index 0000000..5de1c84
--- /dev/null
+++ b/semantic/src/top_level.rs
@@ -0,0 +1,18 @@
+use std::collections::HashMap;
+
+pub struct TypeSymbol {
+    export: bool,
+    name: String,
+}
+
+pub struct FunctionSymbol {
+    export: bool,
+    name: String,
+    params: HashMap<String, TypeSymbol>,
+}
+
+pub struct StructSymbol {
+    export: bool,
+    name: String,
+    fields: HashMap<String, TypeSymbol>,
+}