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diff --git a/poxml/antlr/antlr/ASTRefCount.h b/poxml/antlr/antlr/ASTRefCount.h
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+#ifndef INC_ASTRefCount_hpp__
+# define INC_ASTRefCount_hpp__
+
+/**
+ * <b>SOFTWARE RIGHTS</b>
+ * <p>
+ * ANTLR 2.6.0 MageLang Insitute, 1999
+ * <p>
+ * We reserve no legal rights to the ANTLR--it is fully in the
+ * public domain. An individual or company may do whatever
+ * they wish with source code distributed with ANTLR or the
+ * code generated by ANTLR, including the incorporation of
+ * ANTLR, or its output, into commerical software.
+ * <p>
+ * We encourage users to develop software with ANTLR. However,
+ * we do ask that credit is given to us for developing
+ * ANTLR. By "credit", we mean that if you use ANTLR or
+ * incorporate any source code into one of your programs
+ * (commercial product, research project, or otherwise) that
+ * you acknowledge this fact somewhere in the documentation,
+ * research report, etc... If you like ANTLR and have
+ * developed a nice tool with the output, please mention that
+ * you developed it using ANTLR. In addition, we ask that the
+ * headers remain intact in our source code. As long as these
+ * guidelines are kept, we expect to continue enhancing this
+ * system and expect to make other tools available as they are
+ * completed.
+ * <p>
+ * The ANTLR gang:
+ * @version ANTLR 2.6.0 MageLang Insitute, 1999
+ * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
+ * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
+ * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
+ */
+
+# include "antlr/config.h"
+
+ANTLR_BEGIN_NAMESPACE(antlr)
+
+	class AST;
+
+struct ASTRef
+{
+	AST* const ptr;
+	unsigned int count;
+
+	ASTRef(AST* p);
+	~ASTRef();
+	ASTRef* increment();
+	bool decrement();
+
+	static ASTRef* getRef(const AST* p);
+private:
+	ASTRef( const ASTRef& );
+	ASTRef& operator=( const ASTRef& );
+};
+
+template<class T>
+	class ASTRefCount
+{
+private:
+	ASTRef* ref;
+
+public:
+	ASTRefCount(const AST* p=0) 
+		: ref(p ? ASTRef::getRef(p) : 0)
+	{
+	}
+	ASTRefCount(const ASTRefCount<T>& other)
+		: ref(other.ref ? other.ref->increment() : 0)
+	{
+	}
+	~ASTRefCount()
+	{
+		if (ref && ref->decrement()) delete ref;
+	}
+	ASTRefCount<T>& operator=(AST* other)
+	{
+		ASTRef* tmp=ASTRef::getRef(other);
+		if (ref && ref->decrement()) delete ref;
+		ref=tmp;
+		return *this;
+	}
+	ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
+	{
+		ASTRef* tmp=other.ref ? other.ref->increment() : 0;
+		if (ref && ref->decrement()) delete ref;
+		ref=tmp;
+		return *this;
+	}
+
+	operator T* () const
+		{ return ref ? static_cast<T*>(ref->ptr) : 0; }
+	T* operator->() const
+		{ return ref ? static_cast<T*>(ref->ptr) : 0; }
+	T* get() const
+		{ return ref ? static_cast<T*>(ref->ptr) : 0; }
+};
+
+typedef ASTRefCount<AST> RefAST;
+
+ANTLR_END_NAMESPACE
+
+#endif //INC_ASTRefCount_hpp__