Index: TestExtensions.java
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--- TestExtensions.java	(revision 0)
+++ TestExtensions.java	(working copy)
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package javax.jdo.annotations;
+
+/*
+ * TestExtensions verifies that annotations can include vendor extensions.
+ * This class is not used except to verify that it compiles.
+ * https://issues.apache.org/jira/browse/JDO-728
+ * Add extensions element to @Index, @ForeignKey, @Unique, @PrimaryKey annotations.
+ */
+public abstract class TestExtensions {
+    
+    /** Creates a new instance of TestExtensions */
+    public TestExtensions() {
+    }
+
+    @Persistent(table="LINES")
+    @PrimaryKey(extensions= {
+            @Extension(vendorName = "vendor 1", key = "key 1", value = "value 1"),
+            @Extension(vendorName = "vendor 2", key = "key 2", value = "value 2")}
+    )
+    long pk;
+
+    @Index(extensions= {
+            @Extension(vendorName = "vendor 1", key = "key 1", value = "value 1"),
+            @Extension(vendorName = "vendor 2", key = "key 2", value = "value 2")}
+    )
+    @Unique(extensions= {
+            @Extension(vendorName = "vendor 1", key = "key 1", value = "value 1"),
+            @Extension(vendorName = "vendor 2", key = "key 2", value = "value 2")}
+    )
+    @ForeignKey(extensions= {
+            @Extension(vendorName = "vendor 1", key = "key 1", value = "value 1"),
+            @Extension(vendorName = "vendor 2", key = "key 2", value = "value 2")}
+    )
+    long fk;
+}

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