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diff --git a/qlparser/qtexecute.hh b/qlparser/qtexecute.hh
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+#ifndef __QTEXECUTE_HH__
+#define __QTEXECUTE_HH__
+
+#include "qlparser/qtnode.hh"
+
+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+*/
+/*************************************************************
+ *
+ *
+ * COMMENTS:
+ *
+ ************************************************************/
+
+//@ManMemo: Module: {\bf qlparser}
+
+/*@Doc:
+
+*/
+
+class QtExecute : public QtNode
+{
+  public:
+    /// method for evaluating the execute node node
+    virtual int evaluate() = 0;
+
+    /// type checking
+    virtual void checkType() = 0;
+    /**
+      The method triggers type checking of the node's subtree. If an error occurs, an exception
+      is raised. 
+    */
+};
+
+#endif
+
+
+
+
+
+
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+