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diff --git a/engines/glk/archetype/expression.h b/engines/glk/archetype/expression.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ARCHETYPE_EXPRESSION
+#define ARCHETYPE_EXPRESSION
+
+#include "glk/archetype/keywords.h"
+#include "glk/archetype/linked_list.h"
+#include "glk/archetype/misc.h"
+
+namespace Glk {
+namespace Archetype {
+
+const int OP_LPAREN = NUM_OPERS + 1;		// book-keeping operator
+const int OP_SEND_TO_TYPE = NUM_OPERS + 2;	// for use with interpreter
+
+struct OperNode {
+	int8 op_name;
+	union ExprNode *left, *right;
+};
+
+struct MessageTextQuoteNode {
+	int index;
+};
+
+struct NumericNode {
+	int acl_int;
+};
+
+struct StrNode {
+	StringPtr acl_str;
+};
+
+struct AttrNode {
+	NodePtr acl_attr;
+};
+
+struct ReservedNode {
+	int8 keyword;
+};
+
+struct IdentNode {
+	ClassifyType ident_kind;
+	int ident_int;
+};
+
+union ExprNode {
+	AclType _kind;
+	OperNode _oper;
+	NumericNode _numeric;
+	MessageTextQuoteNode _msgTextQuote;
+	StrNode _str;
+	AttrNode _attr;
+	ReservedNode _reserved;
+	IdentNode _ident;
+};
+
+typedef ExprNode *ExprPtr;
+typedef ExprPtr ExprTree;
+
+// Global variables
+extern bool Right_Assoc[NUM_OPERS + 1];
+extern bool Binary[NUM_OPERS + 1];
+extern int8 Precedence[NUM_OPERS + 1];
+
+extern void expression_init();
+
+} // End of namespace Archetype
+} // End of namespace Glk
+
+#endif