如果站点地图包含引用另一站点地图文件的节点，而该文件又位于应用程序之外，则会发生异常。
If a site map contains a node that references another site-map file, and the file location is outside of the application, an exception occurs.
告诉我们你所有的页面通过提交站点地图文件；让我们知道哪个网页对你来说最重要和更新的频率。
Tell us all about your pages by submitting a Sitemap file; help us learn which pages are most important to you and how often those pages change.
其他网站地图规则，比如个站点地图文件包含的网址不得超过50，000 个，且未压缩时的文件大小不得超过10 MB。
The rest of the Sitemap rules, like 50,000 max URLs in one file and the 10MB uncompressed file size limit, still apply.
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