diff --git a/internal/handler/korcen.go b/internal/handler/korcen.go
index a696f5e..b480802 100644
--- a/internal/handler/korcen.go
+++ b/internal/handler/korcen.go
@@ -1,3 +1,5 @@
+// internal/handler/korcen.go
+
 package handler
 
 import (
diff --git a/internal/handler/respond.go b/internal/handler/respond.go
index 142f04a..7b134f0 100644
--- a/internal/handler/respond.go
+++ b/internal/handler/respond.go
@@ -1,11 +1,23 @@
+// internal/handler/respond.go
+
 package handler
 
-import "github.com/gin-gonic/gin"
+import (
+	"github.com/gin-gonic/gin"
+)
+
+type ResponseType int
+
+const (
+	JSON ResponseType = iota
+	XML
+)
 
-func respond(c *gin.Context, status int, isXML bool, payload interface{}) {
-	if isXML {
+func respond(c *gin.Context, status int, responseType ResponseType, payload interface{}) {
+	switch responseType {
+	case XML:
 		c.XML(status, payload)
-	} else {
+	default:
 		c.JSON(status, payload)
 	}
 }