Graham Aash Yes raw xml on xtgem is treated just like html and gets ads etc
if you want to submit a sitemap you need to compress it on a pc or online service using .gz compression and submit it as sitemap.xml.gz
google accepts compressed sitemaps

 Aash It is impossible to submit XML Sitemap of xtgem site because Google Webmaster Tools always detects it as HTML. This is really a serious problem, please solve it.