--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/SyntaxTag.java	Wed Jul 02 16:06:42 2014 -0700
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+package com.oracle.truffle.api.instrument;
+
+/**
+ * Program element "tags", presumed to be singletons (best implemented as enums) that define
+ * user-visible behavior for debugging and other simple tools. These categories should correspond to
+ * program structures, for example "statement" and "assignment", that are meaningful
+ * ("human-sensible") to guest language programmers.
+ * <p>
+ * An untagged Truffle node should be understood as an artifact of the guest language implementation
+ * and should not be visible to guest language programmers. Nodes may also have more than one tag,
+ * for example a variable assignment that is also a statement. Finally, the assignment of tags to
+ * nodes could depending on the use-case of whatever tool is using them.
+ * <p>
+ * <strong>Disclaimer:</strong> experimental interface under development.
+ *
+ * @see Probe
+ * @see Wrapper
+ * @see StandardSyntaxTag
+ */
+public interface SyntaxTag {
+
+    /**
+     * Human-friendly name of guest language program elements belonging to the category, e.g.
+     * "statement".
+     */
+    String name();
+
+    /**
+     * Criteria and example uses for the tag.
+     */
+    String getDescription();
+
+}