mInner.Init(this, nsnull);
mInner.Init(this, aNodeInfo);
nsDocumentFragment::nsDocumentFragment(nsIDocument* aOwnerDocument){  NS_INIT_REFCNT();  mInner.Init(this, nsnull);  mScriptObject = nsnull;  mOwnerDocument = aOwnerDocument;  NS_IF_ADDREF(mOwnerDocument);}