diff --git a/main/Scene-load.cc b/main/Scene-load.cc
index 9a4c75a..e4b982c 100644
--- a/main/Scene-load.cc
+++ b/main/Scene-load.cc
@@ -9,6 +9,7 @@
 #include "parser/parser.h"
 #include "parser/nodes.h"
 #include "util/Polygon.h"
+#include "util/Scope.h"
 
 using namespace std;
 
diff --git a/util/Scope.h b/util/Scope.h
new file mode 100644
index 0000000..9089053
--- /dev/null
+++ b/util/Scope.h
@@ -0,0 +1,55 @@
+
+#ifndef SCOPE_H
+#define SCOPE_H
+
+#include <list>
+#include <map>
+#include <string>
+
+class Scope
+{
+    public:
+        Scope() { push(); }
+        bool contains(const std::string & key)
+        {
+            for (m_list_type::const_reverse_iterator it = m_list.rbegin();
+                 it != m_list.rend();
+                 it++)
+            {
+                if (it->find(key) != it->end())
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+        double & operator[](const std::string & key)
+        {
+            for (m_list_type::reverse_iterator it = m_list.rbegin();
+                 it != m_list.rend();
+                 it++)
+            {
+                if (it->find(key) != it->end())
+                {
+                    return (*it)[key];
+                }
+            }
+            return (*m_list.rbegin())[key];
+        }
+        void push()
+        {
+            m_list.push_back(std::map< std::string, double >());
+        }
+        void pop()
+        {
+            if (m_list.size() > 1)
+            {
+                m_list.pop_back();
+            }
+        }
+    protected:
+        typedef std::list< std::map< std::string, double > > m_list_type;
+        m_list_type m_list;
+};
+
+#endif