--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/internal/mozilla/nsIObserverService.d	Wed Aug 06 18:29:44 2008 -0700
@@ -0,0 +1,28 @@
+module dwt.internal.mozilla.nsIObserverService;
+
+import dwt.internal.mozilla.Common;
+import dwt.internal.mozilla.nsID;
+import dwt.internal.mozilla.nsISupports;
+import dwt.internal.mozilla.nsIObserver;
+import dwt.internal.mozilla.nsISimpleEnumerator;
+
+const char[] NS_IOBSERVERSERVICE_IID_STR = "d07f5192-e3d1-11d2-8acd-00105a1b8860";
+
+const nsIID NS_IOBSERVERSERVICE_IID= 
+  {0xd07f5192, 0xe3d1, 0x11d2, 
+    [ 0x8a, 0xcd, 0x00, 0x10, 0x5a, 0x1b, 0x88, 0x60 ]};
+
+extern(System)
+
+interface nsIObserverService : nsISupports {
+
+  static const char[] IID_STR = NS_IOBSERVERSERVICE_IID_STR;
+  static const nsIID IID = NS_IOBSERVERSERVICE_IID;
+
+  nsresult AddObserver(nsIObserver anObserver, char *aTopic, PRBool ownsWeak);
+  nsresult RemoveObserver(nsIObserver anObserver, char *aTopic);
+  nsresult NotifyObservers(nsISupports aSubject, char *aTopic, PRUnichar *someData);
+  nsresult EnumerateObservers(char *aTopic, nsISimpleEnumerator *_retval);
+
+}
+