diff --git a/src/main.rs b/src/main.rs
index e4c6f39..cc8c4dd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,10 +4,24 @@ pub mod om;
 pub mod renderer;
 
 fn main() {
-  let mut input = String::new();
-  io::stdin().read_to_string(&mut input).expect("Failed to read from stdin");
-  om::tokenizer::Tokenizer::new(input).for_each(|token| {
-    println!("\n{:?}", token);
-  });
-  println!();
+    let mut input = String::new();
+    io::stdin()
+        .read_to_string(&mut input)
+        .expect("Failed to read from stdin");
+    let mut index = 0;
+    om::tokenizer::Tokenizer::new(input).for_each(|token| {
+        if let om::tokenizer::Token::NodeEnd = token {
+            index -= 1;
+        }
+        println!("{}{:?}", "  ".repeat(index), token);
+        if let om::tokenizer::Token::Define {
+            name,
+            component,
+            behavior,
+        } = token
+        {
+            index += 1;
+        }
+    });
+    println!();
 }
diff --git a/src/om/tokenizer.rs b/src/om/tokenizer.rs
index f7988dd..10e8433 100644
--- a/src/om/tokenizer.rs
+++ b/src/om/tokenizer.rs
@@ -49,7 +49,7 @@ impl Iterator for Tokenizer {
                 return Some(Token::EOF);
             }
             let c = self.consume_input();
-            print!("{}", c);
+            // print!("{}", c);
             match self.state {
                 State::Data => match c {
                     '(' => {
@@ -81,6 +81,16 @@ impl Iterator for Tokenizer {
                         self.state = State::AfterDefine;
                         self.latest = Some(Token::Define {
                             name: self.buffer.clone(),
+                            component: None,
+                            behavior: Behavior::new(),
+                        });
+                        self.buffer.clear();
+                    }
+                    '<' => {
+                        self.state = State::CompCall;
+                        self.latest = Some(Token::Define {
+                            name: self.buffer.clone(),
+                            component: None,
                             behavior: Behavior::new(),
                         });
                         self.buffer.clear();
@@ -93,6 +103,31 @@ impl Iterator for Tokenizer {
                         if self.is_eof() {
                             return Some(Token::Define {
                                 name: self.buffer.clone(),
+                                component: None,
+                                behavior: Behavior::new(),
+                            });
+                        }
+                    }
+                },
+                State::CompCall => match c {
+                    '>' => {
+                        self.state = State::AfterDefine;
+                        if let Some(t) = self.latest.as_mut() {
+                            if let Token::Define { component, .. } = t {
+                                *component = Some(self.buffer.clone());
+                            }
+                        }
+                        self.buffer.clear();
+                    }
+                    _ => {
+                        if !c.is_ascii_alphanumeric() {
+                            panic!("Unexpected character: {}", c);
+                        }
+                        self.buffer.push(c);
+                        if self.is_eof() {
+                            return Some(Token::Define {
+                                name: self.buffer.clone(),
+                                component: None,
                                 behavior: Behavior::new(),
                             });
                         }
@@ -172,7 +207,6 @@ impl Iterator for Tokenizer {
 
                             self.reconsume = true;
                             self.state = State::Behavior;
-                            println!("BehaviorItem: {:?}", BehaviorItem::from(&self.buffer));
                         }
                     }
                 },
@@ -186,6 +220,7 @@ enum State {
     Data,
     NodeOpen,
     Define,
+    CompCall,
     AfterDefine,
     Behavior,
     BehaviorSeparator,
@@ -193,7 +228,11 @@ enum State {
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum Token {
-    Define { name: String, behavior: Behavior },
+    Define {
+        name: String,
+        component: Option<String>,
+        behavior: Behavior,
+    },
     Character(char),
     NodeEnd,
     EOF,
@@ -217,6 +256,7 @@ mod tests {
         let expected = [
             Token::Define {
                 name: "foo".to_string(),
+                component: None,
                 behavior: Behavior {
                     items: vec![BehaviorItem::KeyValue {
                         prefix: Some("prefix".to_string()),
@@ -239,6 +279,7 @@ mod tests {
         let expected = [
             Token::Define {
                 name: "foo".to_string(),
+                component: None,
                 behavior: Behavior {
                     items: vec![BehaviorItem::KeyValue {
                         prefix: Some("prefix".to_string()),
@@ -249,6 +290,7 @@ mod tests {
             },
             Token::Define {
                 name: "bar".to_string(),
+                component: None,
                 behavior: Behavior {
                     items: vec![BehaviorItem::KeyValue {
                         prefix: Some("prefix".to_string()),