nsresult nsContentIterator::CurrentNode(nsIContent **aNode)
nsresult nsGeneratedContentIterator::CurrentNode(nsIContent **aNode)
nsresult nsContentIterator::CurrentNode(nsIContent **aNode){  if (!mCurNode)     return NS_ERROR_FAILURE;  if (mIsDone)     return NS_ERROR_FAILURE;  return mCurNode->QueryInterface(NS_GET_IID(nsIContent), (void**) aNode);}