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diff --git a/src/expr/expr_stream.h b/src/expr/expr_stream.h
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+/*********************                                                        */
+/*! \file expr_stream.h
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief A stream interface for expressions
+ **
+ ** A stream interface for expressions.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef __CVC4__EXPR_STREAM_H
+#define __CVC4__EXPR_STREAM_H
+
+#include "expr/expr.h"
+
+namespace CVC4 {
+
+/**
+ * A pure-virtual stream interface for expressions.  Can be used to
+ * communicate streams of expressions between different parts of CVC4.
+ */
+class CVC4_PUBLIC ExprStream {
+public:
+  /** Virtual destructor; this implementation does nothing. */
+  virtual ~ExprStream() {}
+
+  /**
+   * Get the next expression in the stream (advancing the stream
+   * pointer as a side effect.)
+   */
+  virtual Expr nextExpr() = 0;
+};/* class ExprStream */
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__EXPR_STREAM_H */
+