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diff --git a/ACE/ACEXML/common/Element_Def_Builder.h b/ACE/ACEXML/common/Element_Def_Builder.h
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+++ b/ACE/ACEXML/common/Element_Def_Builder.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Element_Def_Builder.h
+ *
+ *  $Id$
+ *
+ *  @author Nanbor Wang <nanbor@cs.wustl.edu>
+ */
+//=============================================================================
+#ifndef _ACEXML_ELEMENT_DEF_BUILDER_H_
+#define _ACEXML_ELEMENT_DEF_BUILDER_H_
+
+#include /**/ "ace/pre.h"
+#include "ACEXML/common/ACEXML_Export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+#pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/Auto_Ptr.h"
+#include "ACEXML/common/XML_Types.h"
+#include "ACEXML/common/SAXExceptions.h"
+
+/**
+ * @class ACEXML_Element_Def_Builder
+ *
+ * @brief An abstract virtual class that defines the interface to define an
+ * element definition.
+ *
+ * This class defines how to define an element definition after parsing a
+ * DTD.
+ */
+class ACEXML_Export ACEXML_Element_Def_Builder
+{
+public:
+
+  typedef auto_ptr<ACEXML_Element_Def_Builder> VAR;
+
+  typedef enum {
+    EMPTY,
+    ANY,
+    MIXED,
+    CHILDREN,
+    UNDEFINED
+  } CONTENT_TYPE;
+
+  typedef enum {
+    ONE,
+    ZERO_OR_MORE,
+    ONE_OR_MORE,
+    ONE_OR_ZERO
+  } CARDINALITY;
+
+  virtual ~ACEXML_Element_Def_Builder () = 0;
+
+  /**
+   * Define the name of the element.
+   *
+   * @retval 0 if valid, -1 otherwise.
+   */
+  virtual int setElementName (const ACEXML_Char *namespaceURI,
+                              const ACEXML_Char *localName,
+                              const ACEXML_Char *qName)
+        = 0;
+
+  /**
+   * Define the content type of the element.
+   *
+   * @retval 0 if valid, -1 otherwise.
+   */
+  virtual int setContentType (CONTENT_TYPE type)
+        = 0;
+
+  /**
+   * Insert one more element into Mixed definition.
+   */
+  virtual int insertMixedElement (const ACEXML_Char *namespaceURI,
+                                  const ACEXML_Char *localName,
+                                  const ACEXML_Char *qName)
+        = 0;
+
+  /**
+   * Start a new group of children.
+   */
+  virtual int startChildGroup () = 0;
+
+  /**
+   * End a new group of children.
+   *
+   * @retval 0 on success.
+   */
+  virtual int endChildGroup (CARDINALITY card) = 0;
+
+  /**
+   * Set the type of current child group to Choice.
+   *
+   * @retval 0 on success, -1 if the type of the child group has
+   * already been set and this action conflicts with the previous
+   * setting.
+   */
+  virtual int setChoice () = 0;
+
+  /**
+   * Set the type of current child group to Sequence.
+   *
+   * @retval 0 on success, -1 if the type of the child group has
+   * already been set and this action conflicts with the previous
+   * setting.
+   */
+  virtual int setSequence () = 0;
+
+  /**
+   * Insert an new element into the current child group.
+   *
+   * @retval 0 on success, -1 otherwise.
+   */
+  virtual int insertElement  (const ACEXML_Char *namespaceURI,
+                              const ACEXML_Char *localName,
+                              const ACEXML_Char *qName)
+        = 0;
+
+  /**
+   * Dump the content of the attribute definition.
+   */
+  virtual void dump (void) = 0;
+};
+
+
+#include /**/ "ace/post.h"
+
+#endif /* _ACEXML_ELEMENT_DEF_BUILDER_H_ */