如何验证兼容的XML站点地图？

For the following header I get the same two errors on all my sitemaps. It's confusing because, if Google can't read my sitemap, then how can they say that each URL has the same priority? The header counts as line 2, after the XML declaration. Google claims only to have indexed about 2% of the URLs from the maps. Please help.For the following header I get the same two err