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//------------------------------------------------------------------------------
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// This file is part of Toolkit for Conceptual Modeling (TCM).
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// (c) copyright 1995, Vrije Universiteit Amsterdam.
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// Author: Frank Dehne (frank@cs.vu.nl).
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// TCM is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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// TCM is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with TCM; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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//-----------------------------------------------------------------------------
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/// entity-relationship graph class
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class ERGraph: public Graph {
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/*@Doc: {\large {\bf scope:} TERD} */
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/// returns if an is\_a edge leaves this subject.
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bool IsaLeaves(Subject *s);
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/// returns if there is an is\_a path from n1 to n2.
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bool IsaPathExists(Subject *n1, Subject *n2);
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bool IsaPathExists(Subject *n1, Subject *n2, List<Edge *> *path);
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/// return the subject that is a generalization of this subject
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Subject *GetGeneralization(Subject *s);
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void InitConnections();