--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/StandardTag.java	Mon May 12 20:17:25 2014 -0700
@@ -0,0 +1,77 @@
+/*
+ * 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;
+
+/**
+ * A somewhat language-agnostic set of phylum categories, suitable for conventional imperative
+ * languages, and is being developed incrementally.
+ * <p>
+ * The need for alternative sets of tags is likely to arise, perhaps for other families of languages
+ * (for example for mostly expression-oriented languages) or even for specific languages.
+ * <p>
+ * <strong>Disclaimer:</strong> experimental interface under development.
+ *
+ * @see Probe
+ * @see Wrapper
+ */
+public enum StandardTag implements PhylumTag {
+
+    /**
+     * Marker for a variable assignment.
+     */
+    ASSIGNMENT("assignment", "a variable assignment"),
+
+    /**
+     * Marker for a call site.
+     */
+    CALL("call", "a method/procedure call site"),
+
+    /**
+     * Marker for a location where a guest language exception is about to be thrown.
+     */
+    THROW("throw", "creator of an exception"),
+
+    /**
+     * Marker for a location where ordinary "stepping" should halt.
+     */
+    STATEMENT("statement", "basic unit of the language, suitable for \"stepping\" in a debugger");
+
+    private final String name;
+    private final String description;
+
+    private StandardTag(String name, String description) {
+        this.name = name;
+        this.description = description;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+}