--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/package-info.java	Mon Jun 08 04:50:13 2015 +0200
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Inter-operability between different languages is covered by this package.
+ * In case you are implementing own {@link com.oracle.truffle.api.TruffleLanguage} and you want
+ * to interact with other {@link com.oracle.truffle.api.TruffleLanguage language implementations}
+ * you need to use types from this package.
+ * <p>
+ * Different languages can exchange either wrappers of primitive Java
+ * types (like {@link Integer}, {@link Double}, {@link String}), or they
+ * can export their own types (if they implement {@link TruffleObject} interface).
+ * Btw. One can recognize foreign object if it implements {@link TruffleObject}.
+ * <p>
+ * To use {@link TruffleObject} from a different language one needs to ask
+ * the language to build appropriate AST for a given {@link Message}. To do
+ * so use {@link ForeignAccess#node(com.oracle.truffle.api.interop.Message)}
+ * and when calling it {@link ForeignAccess#execute(com.oracle.truffle.api.nodes.Node, com.oracle.truffle.api.frame.VirtualFrame, com.oracle.truffle.api.interop.TruffleObject, java.lang.Object...)}.
+ */
+package com.oracle.truffle.api.interop;
+