added a mechanism to refer to controls in the ancestor, not just the siblings.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@34581 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/RelativePath.java

@@ -0,0 +1,28 @@
+package hudson;
+
+import org.kohsuke.stapler.QueryParameter;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.*;
+import static java.lang.annotation.RetentionPolicy.*;
+
+/**
+ * Used in conjunction with {@link QueryParameter} to refer to
+ * nearby parameters that belong to different parents.
+ *
+ * <p>
+ * Currently, "..", "../..", etc. are supported to indicate
+ * parameters that belong to the ancestors.
+ *
+ * @author Kohsuke Kawaguchi
+ * @since 1.376
+ */
+@Documented
+@Target(PARAMETER)
+@Retention(RUNTIME)
+public @interface RelativePath {
+    String value();
+}