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diff --git a/SA_POP/SANet/SANet_Exceptions.h b/SA_POP/SANet/SANet_Exceptions.h
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+// -*- C++ -*-
+// $Id$
+
+//=============================================================================
+/**
+ * @file  SANet_Exceptions.h
+ *
+ * This file contains the exception definitions for spreading activation
+ * networks.
+ *
+ * @author  John S. Kinnebrew <john.s.kinnebrew@vanderbilt.edu>
+ */
+//=============================================================================
+
+#ifndef SANET_EXCEPTIONS_H_
+#define SANET_EXCEPTIONS_H_
+
+#include <stdexcept>
+
+namespace SANet {
+  /**
+   * @class Invalid_Step
+   *
+   * @brief Exception class for invalid step arguments.
+   */
+  class Invalid_Step : public std::invalid_argument {
+  public:
+    /// Constructor.
+    Invalid_Step (void);
+  };
+
+  /**
+   * @class Update_Error
+   *
+   * @brief Exception class for unrecoverable update errors.
+   */
+  class Update_Error : public std::logic_error {
+  public:
+    /// Constructor.
+    Update_Error (void);
+  };
+
+  /**
+   * @class Duplicate_ID
+   *
+   * @brief Exception class for duplicate ID value during node creation.
+   */
+  class Duplicate_ID : public std::invalid_argument {
+  public:
+    /// Constructor.
+    Duplicate_ID (void);
+  };
+
+  /**
+   * @class Insertion_Error
+   *
+   * @brief Exception class for unknown errors during map/set insertion.
+   */
+  class Insertion_Error : public std::logic_error {
+  public:
+    /// Constructor.
+    Insertion_Error (void);
+  };
+
+  /**
+   * @class UnknownNode
+   *
+   * @brief Exception class for unknown node error when looking up a node.
+   */
+  class UnknownNode : public std::invalid_argument {
+  public:
+    /// Constructor.
+    UnknownNode (void);
+  };
+
+};  /* SANet namespace */
+
+
+#endif /* SANET_EXCEPTIONS_H_ */