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+/*
+ * Copyright (C) 2009 The JSR-330 Expert Group
+ *
+ * Licensed 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.inject;
+
+import java.lang.annotation.Target;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Documented;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
+
+/**
+ * Identifies qualifier annotations. Anyone can define a new qualifier. A
+ * qualifier annotation:
+ *
+ * <ul>
+ * <li>is annotated with {@code @Qualifier}, {@code @Retention(RUNTIME)},
+ * and typically {@code @Documented}.</li>
+ * <li>can have attributes.</li>
+ * <li>may be part of the public API, much like the dependency type, but
+ * unlike implementation types which needn't be part of the public
+ * API.</li>
+ * <li>may have restricted usage if annotated with {@code @Target}. While
+ * this specification covers applying qualifiers to fields and
+ * parameters only, some injector configurations might use qualifier
+ * annotations in other places (on methods or classes for example).</li>
+ * </ul>
+ *
+ * <p>For example:
+ *
+ * <pre>
+ * &#064;java.lang.annotation.Documented
+ * &#064;java.lang.annotation.Retention(RUNTIME)
+ * &#064;javax.inject.Qualifier
+ * public @interface Leather {
+ * Color color() default Color.TAN;
+ * public enum Color { RED, BLACK, TAN }
+ * }</pre>
+ *
+ * @see javax.inject.Named @Named
+ */
+@Target(ANNOTATION_TYPE)
+@Retention(RUNTIME)
+@Documented
+public @interface Qualifier {}