diff --git a/src/LINQ/RQL/IndexWriter.vb b/src/LINQ/RQL/IndexWriter.vb
index 9fd36a1..c69c552 100644
--- a/src/LINQ/RQL/IndexWriter.vb
+++ b/src/LINQ/RQL/IndexWriter.vb
@@ -1,3 +1,36 @@
-Module IndexWriter
+Imports System.IO
+Imports Microsoft.VisualBasic.Data.GraphTheory
+Imports Microsoft.VisualBasic.Data.IO
 
-End Module
+Public Class IndexWriter
+
+    Dim file As BinaryDataWriter
+
+    Sub New(file As Stream)
+        Me.file = New BinaryDataWriter(file)
+    End Sub
+
+    Public Sub Write(tree As Trie(Of NodeMap))
+        Call Write(tree.Root)
+    End Sub
+
+    Public Sub Write(node As CharacterNode(Of NodeMap))
+        Call file.Write(node.Character)
+        Call file.Write(node.Ends)
+        Call file.Write(node.data.size)
+
+        For Each si As String In node.data.resources
+            Call file.Write(si, BinaryStringFormat.ZeroTerminated)
+        Next
+
+        Call file.Write(node.ID)
+        Call file.Write(node.label, BinaryStringFormat.ZeroTerminated)
+
+        Call file.Write(node.Childs.Count)
+
+        For Each val As CharacterNode(Of NodeMap) In node.Childs.Values
+            Call Write(val)
+        Next
+    End Sub
+
+End Class
diff --git a/src/LINQ/RQL/NodeMap.vb b/src/LINQ/RQL/NodeMap.vb
index 4ca62e4..18286ca 100644
--- a/src/LINQ/RQL/NodeMap.vb
+++ b/src/LINQ/RQL/NodeMap.vb
@@ -6,5 +6,10 @@
 Public Class NodeMap
 
     Public Property resources As List(Of String)
+    Public ReadOnly Property size As Integer
+        Get
+            Return resources.Count
+        End Get
+    End Property
 
 End Class