I'm concerned. I recently updated my sitemap generator to create xhtml tags with hreflang in it, to indicate duplicate content pages for different languages. Here's an example:
<url> <loc>http://www.mysite.dk/da</loc> <changefreq>daily</changefreq> <priority>0.5</priority> <xhtml:link rel="alternate" hreflang="da" href="http://www.mysite.dk/da" /> <xhtml:link rel="alternate" hreflang="en" href="http://www.mysite.dk/en" /> </url>
Google loves this, and swallows it whole, but since Bing doesn't recognize the xhtml-tag, will all my alternate references be excluded by Bing, and therefore not appear in their searches?
Should I really make a separate sitemap with xhtml-tags for Google, and serve it from e.g. mysite.dk/GoogleSitemap.xml, and make another one with URL-elements for all the different language-versions of my pages, and serve it from e.g. mysite.dk/NormalSitemap.xml, and only include the latter in my robots.txt?
Thanks for any input!