diff --git a/examples/demo.cpp b/examples/demo.cpp
index 04df3ee..c3e0c1d 100644
--- a/examples/demo.cpp
+++ b/examples/demo.cpp
@@ -2,19 +2,46 @@
 
 #include <iostream>
 
+enum Value {
+    One = 1,
+    Two,
+    Three
+};
+
+namespace string2type {
+
+template <>
+Value convert<Value>(const std::string &value) {
+    std::cout << "special convert function... " << std::endl;
+
+    if (value == "One") {
+        return One;
+    } else if (value == "Two") {
+        return Two;
+    } else if (value == "Three") {
+        return Three;
+    }
+}
+    
+}
+
 struct foo : attributes {
     foo() {
         REGISTER_ATTRIBUTE(int, x);
+        REGISTER_ATTRIBUTE(Value, y);
     }
 
     int x;
+    Value y;
 };
-
+    
 int main(int argc, char *argv) {
     foo f;
     f.set_attribute("x", "42");
+    f.set_attribute("y", "One");
 
     std::cout << f.x << std::endl;
+    std::cout << f.y << std::endl;
 
     return 0;
 }