diff --git a/lemon/lp_skeleton.h b/lemon/lp_skeleton.h
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+++ b/lemon/lp_skeleton.h
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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2008
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_LP_SKELETON
+#define LEMON_LP_SKELETON
+
+#include <lemon/lp_base.h>
+
+///\file
+///\brief A skeleton file to implement LP solver interfaces
+namespace lemon {
+
+  ///A skeleton class to implement LP solver interfaces
+  class LpSkeleton :public LpSolverBase {
+    int col_num,row_num;
+
+  protected:
+
+    ///\e
+    virtual LpSolverBase* _newLp();
+    ///\e
+    virtual LpSolverBase* _copyLp();
+    /// \e
+    virtual int _addCol();
+    /// \e
+    virtual int _addRow();
+    /// \e
+    virtual void _eraseCol(int i);
+    /// \e
+    virtual void _eraseRow(int i);
+    /// \e
+    virtual void _getColName(int col, std::string & name) const;
+    /// \e
+    virtual void _setColName(int col, const std::string & name);
+    /// \e
+    virtual int _colByName(const std::string& name) const;
+
+    /// \e
+    virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
+    /// \e
+    virtual void _getRowCoeffs(int i, RowIterator b) const;
+    /// \e
+    virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
+    /// \e
+    virtual void _getColCoeffs(int i, ColIterator b) const;
+
+    /// Set one element of the coefficient matrix
+    virtual void _setCoeff(int row, int col, Value value);
+
+    /// Get one element of the coefficient matrix
+    virtual Value _getCoeff(int row, int col) const;
+
+    /// The lower bound of a variable (column) have to be given by an
+    /// extended number of type Value, i.e. a finite number of type
+    /// Value or -\ref INF.
+    virtual void _setColLowerBound(int i, Value value);
+    /// \e
+
+    /// The lower bound of a variable (column) is an
+    /// extended number of type Value, i.e. a finite number of type
+    /// Value or -\ref INF.
+    virtual Value _getColLowerBound(int i) const;
+
+    /// The upper bound of a variable (column) have to be given by an
+    /// extended number of type Value, i.e. a finite number of type
+    /// Value or \ref INF.
+    virtual void _setColUpperBound(int i, Value value);
+    /// \e
+
+    /// The upper bound of a variable (column) is an
+    /// extended number of type Value, i.e. a finite number of type
+    /// Value or \ref INF.
+    virtual Value _getColUpperBound(int i) const;
+
+//     /// The lower bound of a linear expression (row) have to be given by an
+//     /// extended number of type Value, i.e. a finite number of type
+//     /// Value or -\ref INF.
+//     virtual void _setRowLowerBound(int i, Value value);
+//     /// \e
+
+//     /// The upper bound of a linear expression (row) have to be given by an
+//     /// extended number of type Value, i.e. a finite number of type
+//     /// Value or \ref INF.
+//     virtual void _setRowUpperBound(int i, Value value);
+
+    /// The lower and upper bound of a linear expression (row) have to be
+    /// given by an
+    /// extended number of type Value, i.e. a finite number of type
+    /// Value or +/-\ref INF.
+    virtual void _setRowBounds(int i, Value lb, Value ub);
+    /// \e
+
+
+    /// The lower and the upper bound of
+    /// a constraint (row) are
+    /// extended numbers of type Value, i.e.  finite numbers of type
+    /// Value, -\ref INF or \ref INF.
+    virtual void _getRowBounds(int i, Value &lb, Value &ub) const;
+    /// \e
+
+
+    /// \e
+    virtual void _clearObj();
+    /// \e
+    virtual void _setObjCoeff(int i, Value obj_coef);
+
+    /// \e
+    virtual Value _getObjCoeff(int i) const;
+
+    ///\e
+
+    ///\bug Wrong interface
+    ///
+    virtual SolveExitStatus _solve();
+
+    ///\e
+
+    ///\bug Wrong interface
+    ///
+    virtual Value _getPrimal(int i) const;
+
+    ///\e
+
+    ///\bug Wrong interface
+    ///
+    virtual Value _getDual(int i) const;
+
+    ///\e
+
+    ///\bug Wrong interface
+    ///
+    virtual Value _getPrimalValue() const;
+
+    ///\e
+
+    ///\bug Wrong interface
+    ///
+    virtual SolutionStatus _getPrimalStatus() const;
+
+    ////e
+    virtual SolutionStatus _getDualStatus() const;
+
+
+    ///\e
+    virtual ProblemTypes _getProblemType() const;
+
+    ///\e
+    virtual void _setMax();
+    ///\e
+    virtual void _setMin();
+
+    ///\e
+    virtual bool _isMax() const;
+
+
+
+    ///\e
+    virtual bool _isBasicCol(int i) const;
+
+
+
+  public:
+    LpSkeleton() : LpSolverBase(), col_num(0), row_num(0) {}
+  };
+
+} //namespace lemon
+
+#endif // LEMON_LP_SKELETON