Mobile Sitemap Issue

[DBC01]

Hi there,

I am having some difficulty with an error on Webmaster Tools.  I'm concerned with a possible duplicate content penalty following the launch of my mobile site.

I have attempted to update my sitemap to inform Google that a different mobile page exists in addition to the desktop page.

I have followed Google's guidelines as outlined here:
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=34648

I'm having problems with my sitemap.xml file.  Webmaster tools is reporting that it is not able to read the file and when I validate it I am getting an error stating that the 'Namespace prefix xhtml on link is not defined'.

All I am trying to do is to create a sitemap that uses the rel="alternate" to inform Google that their is a mobile version of that specific page in addition to the desktop version.

An instance of the code I am using is below:

xml version="1.0" encoding="UTF-8"?> xml-stylesheet type="text/xsl" href="gss.xsl"?> <urlset< span="">xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.google.com/schemas/sitemap/0.84 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"> http://www.mydomain/info/detail/ <xhtml:link< span="">rel="alternate" media="only screen and (max-width: 640px)" href="http://m.mydomain.com/info/detail.html"/> <lastmod></lastmod>2013-02-01T16:03:48+00:00<changefreq></changefreq>daily0.50</xhtml:link<></urlset<>

Any help would be much appreciated.

Thanks

[TextMarketing]

Make sure you're using the rel="canonical" tag on that mobile page. That tells Google that the original content is elsewhere on your site. This will help keep you from getting dinged from search engines.

You can learn more about the rel="canonical" tag here .... http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394