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diff --git a/libxsd-frontend/xsd-frontend/semantic-graph/schema.hxx b/libxsd-frontend/xsd-frontend/semantic-graph/schema.hxx
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+++ b/libxsd-frontend/xsd-frontend/semantic-graph/schema.hxx
@@ -0,0 +1,237 @@
+// file      : xsd-frontend/semantic-graph/schema.hxx
+// copyright : Copyright (c) 2005-2014 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef XSD_FRONTEND_SEMANTIC_GRAPH_SCHEMA_HXX
+#define XSD_FRONTEND_SEMANTIC_GRAPH_SCHEMA_HXX
+
+#include <set>
+#include <vector>
+
+#include <xsd-frontend/semantic-graph/elements.hxx>
+#include <xsd-frontend/semantic-graph/namespace.hxx>
+
+namespace XSDFrontend
+{
+  namespace SemanticGraph
+  {
+    class Schema;
+
+    class Uses: public virtual Edge
+    {
+    public:
+      Schema&
+      user () const
+      {
+        return *user_;
+      }
+
+      Schema&
+      schema () const
+      {
+        return *schema_;
+      }
+
+      Path
+      path () const
+      {
+        return path_;
+      }
+
+    public:
+      Uses (Path const& path): path_ (path) {}
+
+      void
+      set_left_node (Schema& s)
+      {
+        user_ = &s;
+      }
+
+      void
+      set_right_node (Schema& s)
+      {
+        schema_ = &s;
+      }
+
+    private:
+      Path path_;
+      Schema* user_;
+      Schema* schema_;
+    };
+
+
+    //
+    //
+    class Implies: public virtual Uses
+    {
+    public:
+      Implies (Path const& path): Uses (path) {}
+    };
+
+
+    //
+    //
+    class Sources: public virtual Uses
+    {
+    public:
+      Sources (Path const& path): Uses (path) {}
+    };
+
+
+    //
+    //
+    class Includes: public virtual Uses
+    {
+    public:
+      Includes (Path const& path): Uses (path) {}
+    };
+
+
+    //
+    //
+    class Imports: public virtual Uses
+    {
+    public:
+      Imports (Path const& path): Uses (path) {}
+    };
+
+    //
+    //
+    class Schema: public graph, public virtual Scope
+    {
+      typedef std::vector<Uses*> UsesList;
+      typedef std::vector<Uses*> UsedList;
+
+    public:
+      Schema (Path const& file, unsigned long line, unsigned long column)
+          : Node (file, line, column), graph_ (*this)
+      {
+      }
+
+    private:
+      Schema (Schema const&);
+      Schema& operator= (Schema const&);
+
+    public:
+      typedef pointer_iterator<UsesList::const_iterator> UsesIterator;
+
+      UsesIterator
+      uses_begin () const
+      {
+        return uses_.begin ();
+      }
+
+      UsesIterator
+      uses_end () const
+      {
+        return uses_.end ();
+      }
+
+    public:
+      typedef pointer_iterator<UsedList::const_iterator> UsedIterator;
+
+      UsedIterator
+      used_begin () const
+      {
+        return used_.begin ();
+      }
+
+      UsedIterator
+      used_end () const
+      {
+        return used_.end ();
+      }
+
+      bool
+      used_p () const
+      {
+        return used_begin () != used_end ();
+      }
+
+      virtual NamesIteratorPair
+      find (Name const& name) const;
+
+    public:
+      using graph::new_edge;
+      using graph::reset_left_node;
+      using graph::reset_right_node;
+      using graph::add_edge_left;
+      using graph::add_edge_right;
+      using graph::delete_node;
+      using graph::delete_edge;
+
+      template <typename T>
+      T&
+      new_node (Path const& file, unsigned long line, unsigned long column)
+      {
+        return graph_.new_node<T> (file, line, column);
+      }
+
+      template <typename T, typename A0>
+      T&
+      new_node (Path const& file, unsigned long line, unsigned long column,
+                A0 const& a0)
+      {
+        return graph_.new_node<T> (file, line, column, a0);
+      }
+
+      template <typename T, typename A0, typename A1>
+      T&
+      new_node (Path const& file, unsigned long line, unsigned long column,
+                A0 const& a0, A1 const& a1)
+      {
+        return graph_.new_node<T> (file, line, column, a0, a1);
+      }
+
+      template <typename T, typename A0, typename A1, typename A2>
+      T&
+      new_node (Path const& file, unsigned long line, unsigned long column,
+                A0 const& a0, A1 const& a1, A2 const& a2)
+      {
+        return graph_.new_node<T> (file, line, column, a0, a1, a2);
+      }
+
+      template <typename T, typename A0, typename A1, typename A2,
+                typename A3>
+      T&
+      new_node (Path const& file, unsigned long line, unsigned long column,
+                A0 const& a0, A1 const& a1, A2 const& a2, A3 const& a3)
+      {
+        return graph_.new_node<T> (file, line, column, a0, a1, a2, a3);
+      }
+
+    public:
+      using Scope::add_edge_left;
+      using Node::add_edge_right;
+
+      void
+      add_edge_left (Uses& e)
+      {
+        uses_.push_back (&e);
+      }
+
+      void
+      add_edge_right (Uses& e)
+      {
+        used_.push_back (&e);
+      }
+
+    private:
+      typedef std::set<Schema const*> SchemaSet;
+
+      void
+      find_ (Name const& name, NamesList&, SchemaSet&) const;
+
+    private:
+      graph& graph_;
+
+      UsesList uses_;
+      UsedList used_;
+
+      mutable NamesList names_;
+      mutable SchemaSet schemas_;
+    };
+  }
+}
+
+#endif  // XSD_FRONTEND_SEMANTIC_GRAPH_SCHEMA_HXX