For search engines and website crawlers, does the url order have importance in a XML sitemap?
The order of the URLs in your XML Sitemap files doesn’t matter, as clarified by John Muller of Google. According to him, you need to save the start of the file for the most awesome URLs and next, the order among them is no longer matter.
He was even gone onto say that the order in the sitemap file doesn’t matter anymore. If he has to be believed, the most important thing is that your web pages should be awesome in general.
See the forum discussion at Twitter.