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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsILoadGroup;
+
+/**
+ * nsILoadGroupChild provides a hierarchy of load groups so that the
+ * root load group can be used to conceptually tie a series of loading
+ * operations into a logical whole while still leaving them separate
+ * for the purposes of cancellation and status events.
+ */
+
+[scriptable, uuid(02efe8e2-fbbc-4718-a299-b8a09c60bf6b)]
+interface nsILoadGroupChild : nsISupports
+{
+ /**
+ * The parent of this load group. It is stored with
+ * a nsIWeakReference/nsWeakPtr so there is no requirement for the
+ * parentLoadGroup to out live the child, nor will the child keep a
+ * reference count on the parent.
+ */
+ attribute nsILoadGroup parentLoadGroup;
+
+ /**
+ * The nsILoadGroup associated with this nsILoadGroupChild
+ */
+ readonly attribute nsILoadGroup childLoadGroup;
+
+ /**
+ * The rootLoadGroup is the recursive parent of this
+ * load group where parent is defined as parentlLoadGroup if set
+ * or childLoadGroup.loadGroup as a backup. (i.e. parentLoadGroup takes
+ * precedence.) The nsILoadGroup child is the root if neither parent
+ * nor loadgroup attribute is specified.
+ */
+ readonly attribute nsILoadGroup rootLoadGroup;
+};
+