NS_PRECONDITION(aURL != nsnull, "null ptr"); if (! aURL)
NS_PRECONDITION((nsnull != aURL) && (nsnull != aNameSpaceManager), "null ptr"); if ((! aURL) || (! aNameSpaceManager))
RDFContentSinkImpl::Init(nsIURI* aURL){    NS_PRECONDITION(aURL != nsnull, "null ptr");    if (! aURL)        return NS_ERROR_NULL_POINTER;    mDocumentURL = aURL;    NS_ADDREF(aURL);    mState = eRDFContentSinkState_InProlog;    return NS_OK;}