NS_ADDREF(mDB);
NS_ADDREF(*aDataBase);
RDFGenericBuilderImpl::GetDataBase(nsIRDFCompositeDataSource** aDataBase){    NS_PRECONDITION(aDataBase != nsnull, "null ptr");    if (! aDataBase)        return NS_ERROR_NULL_POINTER;    *aDataBase = mDB;    NS_ADDREF(mDB);    return NS_OK;}