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diff --git a/examples/cxx/tree/streaming/parser.hxx b/examples/cxx/tree/streaming/parser.hxx
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+// file      : examples/cxx/tree/streaming/parser.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef PARSER_HXX
+#define PARSER_HXX
+
+#include <string>
+#include <iosfwd>
+#include <memory> // std::auto_ptr
+
+#include <xercesc/dom/DOMDocument.hpp>
+
+#include <xsd/cxx/xml/dom/auto-ptr.hxx>
+
+class parser_impl;
+
+class parser
+{
+public:
+  ~parser ();
+  parser ();
+
+  // The start function returns a "carcase" of the complete document. That
+  // is, the root element with all the attributes but without any content.
+  //
+  xsd::cxx::xml::dom::auto_ptr<xercesc::DOMDocument>
+  start (std::istream& is, const std::string& id, bool validate);
+
+  // The next function returns next first-level element with all its
+  // attributes and content or 0 if no more available.
+  //
+  xsd::cxx::xml::dom::auto_ptr<xercesc::DOMDocument>
+  next ();
+
+private:
+  parser (const parser&);
+
+  parser&
+  operator= (const parser&);
+
+private:
+  std::auto_ptr<parser_impl> impl_;
+};
+
+#endif // PARSER_HXX