diff --git a/src/main.rs b/src/main.rs
index c29e802..2b0a444 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,6 +35,39 @@ struct TreeNode {
     r#type: NodeType,
 }
 
+impl TreeNode {
+    pub fn merge_with(&self, other: &Self) -> Self {
+        if !matches!(self.r#type, NodeType::String | NodeType::Object { .. }) {
+            panic!("Cannot merge!");
+        }
+
+        if !matches!(other.r#type, NodeType::String | NodeType::Object { .. }) {
+            panic!("Cannot merge other!");
+        }
+
+        let r#type = match (&self.r#type, &other.r#type) {
+            (NodeType::String, NodeType::String) => NodeType::String,
+            (NodeType::String, NodeType::Object { children })
+            | (NodeType::Object { children }, NodeType::String) => NodeType::Object {
+                children: children.clone(),
+            },
+
+            (NodeType::Object { children: c1 }, NodeType::Object { children: c2 }) => {
+                let mut children = c1.clone();
+                children.append(&mut c2.clone());
+                NodeType::Object { children }
+            }
+
+            (_, _) => unreachable!(),
+        };
+
+        TreeNode {
+            name: other.name.to_string(),
+            r#type,
+        }
+    }
+}
+
 fn main() {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
@@ -96,6 +129,23 @@ fn build_tree_schema(
         );
     }
 
+    if let Some(subschemas) = &schema.subschemas {
+        if let Some(all_of) = &subschemas.all_of {
+            assert!(!all_of.is_empty());
+            let mut tree =
+                build_tree_schema(expect_schema_object(&all_of[0]), struct_name, components);
+
+            for other in all_of.iter().skip(1) {
+                let other = build_tree_schema(expect_schema_object(other), struct_name, components);
+                tree = tree.merge_with(&other);
+            }
+
+            return tree;
+        } else {
+            panic!("Unsupported case!");
+        }
+    }
+
     let schema_type = schema
         .instance_type
         .as_ref()
@@ -109,8 +159,8 @@ fn build_tree_schema(
             let children = schema
                 .object
                 .as_ref()
-                .unwrap()
-                .properties
+                .map(|s| s.properties.clone())
+                .unwrap_or_default()
                 .iter()
                 .map(|e| {
                     let o = expect_schema_object(e.1);