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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 nsIURI;
+
+/**
+ * nsINestedURI is an interface that must be implemented by any nsIURI
+ * implementation which has an "inner" URI that it actually gets data
+ * from.
+ *
+ * For example, if URIs for the scheme "sanitize" have the structure:
+ *
+ * sanitize:http://example.com
+ *
+ * and opening a channel on such a sanitize: URI gets the data from
+ * http://example.com, sanitizes it, and returns it, then the sanitize: URI
+ * should implement nsINestedURI and return the http://example.com URI as its
+ * inner URI.
+ */
+[scriptable, uuid(6de2c874-796c-46bf-b57f-0d7bd7d6cab0)]
+interface nsINestedURI : nsISupports
+{
+ /**
+ * The inner URI for this nested URI. This must not return null if the
+ * getter succeeds; URIs that have no inner must not QI to this interface.
+ * Dynamically changing whether there is an inner URI is not allowed.
+ *
+ * Modifying the returned URI must not in any way modify the nested URI; this
+ * means the returned URI must be either immutable or a clone.
+ */
+ readonly attribute nsIURI innerURI;
+
+ /**
+ * The innermost URI for this nested URI. This must not return null if the
+ * getter succeeds. This is equivalent to repeatedly calling innerURI while
+ * the returned URI QIs to nsINestedURI.
+ *
+ * Modifying the returned URI must not in any way modify the nested URI; this
+ * means the returned URI must be either immutable or a clone.
+ */
+ readonly attribute nsIURI innermostURI;
+};