diff --git a/Convention/[Symbolization]/Internal/Functional.cs b/Convention/[Symbolization]/Internal/Functional.cs
index 692bcda..c09917b 100644
--- a/Convention/[Symbolization]/Internal/Functional.cs
+++ b/Convention/[Symbolization]/Internal/Functional.cs
@@ -18,7 +18,7 @@ namespace Convention.Symbolization.Internal
 
     public readonly struct FunctionSymbol
     {
-        public readonly string SymbolName;
+        public readonly string FunctionName;
         public readonly Type ReturnType;
         public readonly Type[] ParameterTypes;
         public readonly Modification[] Modifiers;
@@ -26,7 +26,7 @@ namespace Convention.Symbolization.Internal
 
         public FunctionSymbol(string symbolName, Type returnType, Type[] parameterTypes, Modification[] modifiers)
         {
-            this.SymbolName = symbolName;
+            this.FunctionName = symbolName;
             this.ReturnType = returnType;
             this.ParameterTypes = parameterTypes;
             this.Modifiers = modifiers;
diff --git a/Convention/[Symbolization]/Internal/Namespace.cs b/Convention/[Symbolization]/Internal/Namespace.cs
index d230a9c..8a6c68a 100644
--- a/Convention/[Symbolization]/Internal/Namespace.cs
+++ b/Convention/[Symbolization]/Internal/Namespace.cs
@@ -1,29 +1,85 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace Convention.Symbolization.Internal
 {
-    internal sealed class NamespaceModel
+    public sealed class Namespace : Variable<Namespace>
     {
+        public Dictionary<string, Namespace> SubNamespaces = new();
+        public Dictionary<FunctionSymbol, Function> Functions = new();
+        public Dictionary<string, Structure> Structures = new();
 
-    }
+        private readonly Dictionary<string, int> SymbolCounter = new();
+        private readonly Dictionary<string, List<Variable>> Symbol2Variable = new();
 
-    public sealed class Namespace : Variable
-    {
-        private NamespaceModel Data;
-
-        public override object Clone()
+        public void Refresh()
         {
-            Namespace result = new()
+            // Refresh SymbolCounter
+            SymbolCounter.Clear();
+            foreach (var ns in SubNamespaces)
             {
-                Data = Data
-            };
-            return result;
+                ns.Value.Refresh();
+                foreach (var symbol in ns.Value.SymbolCounter)
+                {
+                    if (SymbolCounter.ContainsKey(symbol.Key))
+                        SymbolCounter[symbol.Key] += symbol.Value;
+                    else
+                        SymbolCounter[symbol.Key] = symbol.Value;
+                }
+            }
+            foreach (var func in Functions)
+            {
+                if (SymbolCounter.ContainsKey(func.Key.FunctionName))
+                    SymbolCounter[func.Key.FunctionName]++;
+                else
+                    SymbolCounter[func.Key.FunctionName] = 1;
+            }
+            foreach (var @struct in Structures)
+            {
+                if (SymbolCounter.ContainsKey(@struct.Key))
+                    SymbolCounter[@struct.Key]++;
+                else
+                    SymbolCounter[@struct.Key] = 1;
+            }
         }
 
-        
+        public static Namespace CreateOrGetSubNamespace(string namespaceName, Namespace parent)
+        {
+            if (parent.SubNamespaces.TryGetValue(namespaceName, out var sub))
+                return sub;
+            parent.SubNamespaces[namespaceName] = new(namespaceName);
+            return parent.SubNamespaces[namespaceName];
+        }
+        public static Namespace CreateRootNamespace()
+        {
+            return new("global");
+        }
+
+        private Namespace(string symbolName) : base(symbolName) { }
+
+        public override bool Equals(Namespace other)
+        {
+            return this == other;
+        }
+
+        public string GetNamespaceName() => this.SymbolInfo.SymbolName;
+
+        public bool ContainsSymbol(string symbolName)
+        {
+            return SymbolCounter.ContainsKey(symbolName);
+        }
+
+        public int CountSymbol(string symbolName)
+        {
+            return SymbolCounter.TryGetValue(symbolName, out var count) ? count : 0;
+        }
+
+        public Variable[] Find(string symbolName)
+        {
+            if (!Symbol2Variable.TryGetValue(symbolName,out var result))
+                return Array.Empty<Variable>();
+            return result.ToArray();
+        }
     }
 }
diff --git a/Convention/[Symbolization]/Internal/Variable.cs b/Convention/[Symbolization]/Internal/Variable.cs
index 3f455ff..51b51fc 100644
--- a/Convention/[Symbolization]/Internal/Variable.cs
+++ b/Convention/[Symbolization]/Internal/Variable.cs
@@ -1,36 +1,49 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace Convention.Symbolization.Internal
 {
-    public abstract class Variable : ICloneable, IEquatable<Variable>
+    public abstract class Variable : IEquatable<Variable>
     {
         public readonly VariableSymbol SymbolInfo;
 
-        /// <summary>
-        /// for construct
-        /// </summary>
-        protected Variable(string symbolName, Type variableType)
+        protected Variable(VariableSymbol symbolInfo)
         {
-            SymbolInfo = new VariableSymbol(symbolName, variableType);
+            this.SymbolInfo = symbolInfo;
         }
-        /// <summary>
-        /// for clone
-        /// </summary>
-        protected Variable(string symbolName, Variable variable) : this(symbolName, variable.SymbolInfo.VariableType) { }
 
-        public abstract object Clone();
         public abstract bool Equals(Variable other);
 
         public override bool Equals(object obj)
         {
-            return obj is Variable variable && Equals(variable);
+            return Equals(obj as Variable);
         }
 
-        public abstract int GetVariableHashCode();
+        public override int GetHashCode()
+        {
+            return base.GetHashCode();
+        }
+    }
+
+
+    public abstract class Variable<T> : Variable, IEquatable<T>
+    {
+        protected Variable(string symbolName) : base(new VariableSymbol(symbolName, typeof(T))) { }
+        public abstract bool Equals(T other);
+
+        public override bool Equals(Variable other)
+        {
+            return other is T variable && Equals(variable);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is T variable && Equals(variable);
+        }
+
+        public virtual int GetVariableHashCode()
+        {
+            return base.GetHashCode();
+        }
 
         public override sealed int GetHashCode()
         {
@@ -38,6 +51,22 @@ namespace Convention.Symbolization.Internal
         }
     }
 
+    public abstract class CloneableVariable<T> : Variable<T>, ICloneable
+    {
+        protected CloneableVariable(string symbolName, Type variableType) : base(symbolName)
+        {
+        }
+
+        protected CloneableVariable(string symbolName, CloneableVariable<T> variable) : base(symbolName)
+        {
+        }
+
+        public object Clone() => CloneVariable();
+
+        public abstract T CloneVariable();
+    }
+
+
     public readonly struct VariableSymbol
     {
         public readonly string SymbolName;
@@ -59,9 +88,4 @@ namespace Convention.Symbolization.Internal
             return new Tuple<string, Type>(SymbolName, VariableType).GetHashCode();
         }
     }
-
-    public class VariableContext
-    {
-        public Dictionary<VariableSymbol, Variable> Variables = new();
-    }
 }