diff --git a/dag/ui.go b/dag/ui.go
index 2aeefdb..8124bb4 100644
--- a/dag/ui.go
+++ b/dag/ui.go
@@ -173,7 +173,7 @@ func (tm *DAG) ExportDOT() string {
 				sb.WriteString(`    labelloc="b"; labeljust="c"; fontsize=16;`)
 				sb.WriteString("\n")
 				sb.WriteString(`    margin=50;`)
-				sb.WriteString(`    style=filled,bold; color=gray90;`)
+				sb.WriteString(`    style="filled,bold"; color="gray90";`)
 				sb.WriteString("\n")
 				for _, subNodeKey := range subDAG.TopologicalSort() {
 					subNode, _ := subDAG.nodes.Get(subNodeKey)
@@ -214,7 +214,7 @@ func renderNode(sb *strings.Builder, node *Node, prefix ...string) {
 	switch node.NodeType {
 	case Function:
 		nodeColor = "#D4EDDA" // Light green background for Function
-		labelSuffix = " ƒ"    // Function symbol (ƒ) as a graphical representation
+		labelSuffix = " ƒ(x)" // Function symbol (ƒ) as a graphical representation
 
 	case Page:
 		nodeColor = "#f0d2d1" // Light red background for Page
diff --git a/examples/dag.go b/examples/dag.go
index 6edc258..3c86666 100644
--- a/examples/dag.go
+++ b/examples/dag.go
@@ -4,62 +4,119 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+
 	"github.com/oarkflow/mq"
 	"github.com/oarkflow/mq/dag"
 	"github.com/oarkflow/mq/examples/tasks"
 )
 
-func main() {
-	f := dag.NewDAG("Sample DAG", "sample-dag", func(taskID string, result mq.Result) {
-		fmt.Printf("Final result for task %s: %s\n", taskID, string(result.Payload))
-	}, mq.WithSyncMode(true))
-	f.SetNotifyResponse(func(ctx context.Context, result mq.Result) error {
-		if f.Notifier != nil {
-			f.Notifier.ToRoom("global", "final-message", result)
-		}
-		return nil
-	})
-	setup(f)
-	err := f.Validate()
-	if err != nil {
-		panic(err)
-	}
-	f.Start(context.Background(), ":8082")
-	sendData(f)
-}
-
 func subDAG() *dag.DAG {
 	f := dag.NewDAG("Sub DAG", "sub-dag", func(taskID string, result mq.Result) {
 		fmt.Printf("Final result for task %s: %s\n", taskID, string(result.Payload))
 	}, mq.WithSyncMode(true))
 	f.
-		AddNode(dag.Function, "Store data", "store:data", &tasks.StoreData{Operation: dag.Operation{Type: "process"}}, true).
-		AddNode(dag.Function, "Send SMS", "send:sms", &tasks.SendSms{Operation: dag.Operation{Type: "process"}}).
-		AddNode(dag.Function, "Notification", "notification", &tasks.InAppNotification{Operation: dag.Operation{Type: "process"}}).
+		AddNode(dag.Function, "Store data", "store:data", &tasks.StoreData{Operation: dag.Operation{Type: dag.Function}}, true).
+		AddNode(dag.Function, "Send SMS", "send:sms", &tasks.SendSms{Operation: dag.Operation{Type: dag.Function}}).
+		AddNode(dag.Function, "Notification", "notification", &tasks.InAppNotification{Operation: dag.Operation{Type: dag.Function}}).
 		AddEdge(dag.Simple, "Store Payload to send sms", "store:data", "send:sms").
 		AddEdge(dag.Simple, "Store Payload to notification", "send:sms", "notification")
 	return f
 }
 
-func setup(f *dag.DAG) {
-	f.
-		AddNode(dag.Function, "Email Delivery", "email:deliver", &tasks.EmailDelivery{Operation: dag.Operation{Type: "process"}}).
-		AddNode(dag.Function, "Prepare Email", "prepare:email", &tasks.PrepareEmail{Operation: dag.Operation{Type: "process"}}).
-		AddNode(dag.Function, "Get Input", "get:input", &tasks.GetData{Operation: dag.Operation{Type: "input"}}, true).
-		AddNode(dag.Function, "Iterator Processor", "loop", &tasks.Loop{Operation: dag.Operation{Type: "loop"}}).
-		AddNode(dag.Function, "Condition", "condition", &tasks.Condition{Operation: dag.Operation{Type: "condition"}}).
-		AddDAGNode("Persistent", "persistent", subDAG()).
-		AddEdge(dag.Simple, "Get input to loop", "get:input", "loop").
-		AddEdge(dag.Iterator, "Loop to prepare email", "loop", "prepare:email").
-		AddEdge(dag.Simple, "Prepare Email to condition", "prepare:email", "condition").
-		AddCondition("condition", map[string]string{"pass": "email:deliver", "fail": "persistent"})
+func main() {
+	flow := dag.NewDAG("Sample DAG", "sample-dag", func(taskID string, result mq.Result) {
+		// fmt.Printf("Final result for task %s: %s\n", taskID, string(result.Payload))
+	})
+	flow.AddNode(dag.Function, "GetData", "GetData", &GetData{}, true)
+	flow.AddNode(dag.Function, "Loop", "Loop", &Loop{})
+	flow.AddNode(dag.Function, "ValidateAge", "ValidateAge", &ValidateAge{})
+	flow.AddNode(dag.Function, "ValidateGender", "ValidateGender", &ValidateGender{})
+	flow.AddNode(dag.Function, "Final", "Final", &Final{})
+	flow.AddDAGNode("Check", "persistent", subDAG())
+	flow.AddEdge(dag.Simple, "GetData", "GetData", "Loop")
+	flow.AddEdge(dag.Iterator, "Validate age for each item", "Loop", "ValidateAge")
+	flow.AddCondition("ValidateAge", map[string]string{"pass": "ValidateGender", "default": "persistent"})
+	flow.AddEdge(dag.Simple, "Mark as Done", "Loop", "Final")
+
+	// flow.Start(":8080")
+	data := []byte(`[{"age": "15", "gender": "female"}, {"age": "18", "gender": "male"}]`)
+	if flow.Error != nil {
+		panic(flow.Error)
+	}
+
+	fmt.Println(flow.ExportDOT())
+	rs := flow.Process(context.Background(), data)
+	if rs.Error != nil {
+		panic(rs.Error)
+	}
+	fmt.Println(rs.Status, rs.Topic, string(rs.Payload))
 }
 
-func sendData(f *dag.DAG) {
-	data := []map[string]any{
-		{"phone": "+123456789", "email": "abc.xyz@gmail.com"}, {"phone": "+98765412", "email": "xyz.abc@gmail.com"},
-	}
-	bt, _ := json.Marshal(data)
-	result := f.Process(context.Background(), bt)
-	fmt.Println(string(result.Payload))
+type GetData struct {
+	dag.Operation
+}
+
+func (p *GetData) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
+	return mq.Result{Ctx: ctx, Payload: task.Payload}
+}
+
+type Loop struct {
+	dag.Operation
+}
+
+func (p *Loop) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
+	return mq.Result{Ctx: ctx, Payload: task.Payload}
+}
+
+type ValidateAge struct {
+	dag.Operation
+}
+
+func (p *ValidateAge) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
+	var data map[string]any
+	if err := json.Unmarshal(task.Payload, &data); err != nil {
+		return mq.Result{Error: fmt.Errorf("ValidateAge Error: %s", err.Error()), Ctx: ctx}
+	}
+	var status string
+	if data["age"] == "18" {
+		status = "pass"
+	} else {
+		status = "default"
+	}
+	updatedPayload, _ := json.Marshal(data)
+	return mq.Result{Payload: updatedPayload, Ctx: ctx, ConditionStatus: status}
+}
+
+type ValidateGender struct {
+	dag.Operation
+}
+
+func (p *ValidateGender) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
+	var data map[string]any
+	if err := json.Unmarshal(task.Payload, &data); err != nil {
+		return mq.Result{Error: fmt.Errorf("ValidateGender Error: %s", err.Error()), Ctx: ctx}
+	}
+	data["female_voter"] = data["gender"] == "female"
+	updatedPayload, _ := json.Marshal(data)
+	return mq.Result{Payload: updatedPayload, Ctx: ctx}
+}
+
+type Final struct {
+	dag.Operation
+}
+
+func (p *Final) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
+	var data []map[string]any
+	if err := json.Unmarshal(task.Payload, &data); err != nil {
+		return mq.Result{Error: fmt.Errorf("Final Error: %s", err.Error()), Ctx: ctx}
+	}
+	for i, row := range data {
+		row["done"] = true
+		data[i] = row
+	}
+	updatedPayload, err := json.Marshal(data)
+	if err != nil {
+		panic(err)
+	}
+	return mq.Result{Payload: updatedPayload, Ctx: ctx}
 }
diff --git a/examples/tasks/operations.go b/examples/tasks/operations.go
index dea31d0..9f1513e 100644
--- a/examples/tasks/operations.go
+++ b/examples/tasks/operations.go
@@ -2,7 +2,9 @@ package tasks
 
 import (
 	"context"
+
 	"github.com/oarkflow/json"
+
 	v2 "github.com/oarkflow/mq/dag"
 
 	"github.com/oarkflow/mq"
@@ -85,7 +87,9 @@ func (e *SendSms) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
 	if err != nil {
 		panic(err)
 	}
-	return mq.Result{Payload: task.Payload, Error: nil, Ctx: ctx}
+	data["sms_sent"] = true
+	d, _ := json.Marshal(data)
+	return mq.Result{Payload: d, Ctx: ctx}
 }
 
 type StoreData struct {
@@ -93,7 +97,14 @@ type StoreData struct {
 }
 
 func (e *StoreData) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	return mq.Result{Payload: task.Payload, Ctx: ctx}
+	var data map[string]any
+	err := json.Unmarshal(task.Payload, &data)
+	if err != nil {
+		panic(err)
+	}
+	data["stored"] = true
+	d, _ := json.Marshal(data)
+	return mq.Result{Payload: d, Ctx: ctx}
 }
 
 type InAppNotification struct {
@@ -106,7 +117,9 @@ func (e *InAppNotification) ProcessTask(ctx context.Context, task *mq.Task) mq.R
 	if err != nil {
 		panic(err)
 	}
-	return mq.Result{Payload: task.Payload, Ctx: ctx}
+	data["notified"] = true
+	d, _ := json.Marshal(data)
+	return mq.Result{Payload: d, Ctx: ctx}
 }
 
 type Final struct {
diff --git a/examples/v3.go b/examples/v3.go
deleted file mode 100644
index bb589fb..0000000
--- a/examples/v3.go
+++ /dev/null
@@ -1,107 +0,0 @@
-package main
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"github.com/oarkflow/mq"
-	"github.com/oarkflow/mq/dag"
-)
-
-func main() {
-	flow := dag.NewDAG("Sample DAG", "sample-dag", func(taskID string, result mq.Result) {
-		// fmt.Printf("Final result for task %s: %s\n", taskID, string(result.Payload))
-	})
-	flow.AddNode(dag.Function, "GetData", "GetData", &GetData{}, true)
-	flow.AddNode(dag.Function, "Loop", "Loop", &Loop{})
-	flow.AddNode(dag.Function, "ValidateAge", "ValidateAge", &ValidateAge{})
-	flow.AddNode(dag.Function, "ValidateGender", "ValidateGender", &ValidateGender{})
-	flow.AddNode(dag.Function, "Final", "Final", &Final{})
-
-	flow.AddEdge(dag.Simple, "GetData", "GetData", "Loop")
-	flow.AddEdge(dag.Iterator, "Validate age for each item", "Loop", "ValidateAge")
-	flow.AddCondition("ValidateAge", map[string]string{"pass": "ValidateGender"})
-	flow.AddEdge(dag.Simple, "Mark as Done", "Loop", "Final")
-
-	// flow.Start(":8080")
-	data := []byte(`[{"age": "15", "gender": "female"}, {"age": "18", "gender": "male"}]`)
-	if flow.Error != nil {
-		panic(flow.Error)
-	}
-
-	fmt.Println(flow.ExportDOT())
-	rs := flow.Process(context.Background(), data)
-	if rs.Error != nil {
-		panic(rs.Error)
-	}
-	fmt.Println(rs.Status, rs.Topic, string(rs.Payload))
-}
-
-type GetData struct {
-	dag.Operation
-}
-
-func (p *GetData) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	return mq.Result{Ctx: ctx, Payload: task.Payload}
-}
-
-type Loop struct {
-	dag.Operation
-}
-
-func (p *Loop) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	return mq.Result{Ctx: ctx, Payload: task.Payload}
-}
-
-type ValidateAge struct {
-	dag.Operation
-}
-
-func (p *ValidateAge) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	var data map[string]any
-	if err := json.Unmarshal(task.Payload, &data); err != nil {
-		return mq.Result{Error: fmt.Errorf("ValidateAge Error: %s", err.Error()), Ctx: ctx}
-	}
-	var status string
-	if data["age"] == "18" {
-		status = "pass"
-	} else {
-		status = "default"
-	}
-	updatedPayload, _ := json.Marshal(data)
-	return mq.Result{Payload: updatedPayload, Ctx: ctx, ConditionStatus: status}
-}
-
-type ValidateGender struct {
-	dag.Operation
-}
-
-func (p *ValidateGender) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	var data map[string]any
-	if err := json.Unmarshal(task.Payload, &data); err != nil {
-		return mq.Result{Error: fmt.Errorf("ValidateGender Error: %s", err.Error()), Ctx: ctx}
-	}
-	data["female_voter"] = data["gender"] == "female"
-	updatedPayload, _ := json.Marshal(data)
-	return mq.Result{Payload: updatedPayload, Ctx: ctx}
-}
-
-type Final struct {
-	dag.Operation
-}
-
-func (p *Final) ProcessTask(ctx context.Context, task *mq.Task) mq.Result {
-	var data []map[string]any
-	if err := json.Unmarshal(task.Payload, &data); err != nil {
-		return mq.Result{Error: fmt.Errorf("Final Error: %s", err.Error()), Ctx: ctx}
-	}
-	for i, row := range data {
-		row["done"] = true
-		data[i] = row
-	}
-	updatedPayload, err := json.Marshal(data)
-	if err != nil {
-		panic(err)
-	}
-	return mq.Result{Payload: updatedPayload, Ctx: ctx}
-}