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Just a quick information about the XML Google mobile sitemap. The standard format will be upgradet early. The new XML Google mobile sitemap specifications are available here.
Using the new format, it must be update che number versione declaration and use the new tag
<mobile:mobile/>
For any <loc> reference. The <priority> tag is not mentioned by the new format. By the way it must be considered optional at all. Infact it give just a suggestion to Google for the content's priority. It can be different by the priority calculed by google bot.
The tag <lastmod> should be used in the right way. Expecially for really dinamic contents, like in example, a blog or online journal front page.
A little example of the new Google XML mobile sitemap:
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.google.com/schemas/sitemap/0.84"
xmlns:mobile="http://www.google.com/schemas/sitemap-mobile/1.0">
<url>
<loc>http://www.davidonzo.com/?mobile=1</loc>
<lastmod>2008-09-12</lastmod>
<mobile:mobile/>
</url>
<url>
<loc>http://www.davidonzo.com/?post=890&mobile=1</loc>
<lastmod>2008-09-11</lastmod>
<mobile:mobile/>
</url>
<url>
<loc>http://www.davidonzo.com/?post=889&mobile=1</loc>
<lastmod>2008-09-10</lastmod>
<mobile:mobile/>
</url>
<url>
<loc>http://www.davidonzo.com/?post=888&mobile=1</loc>
<lastmod>2008-09-09</lastmod>
<mobile:mobile/>
</url>
</urlset>
The changes is required in a few days. Remember, sitemap malformed will be NOT indexed by google. So, be careful and rapid!
