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About B, and maybe its related to

If we create a separate sitemap, we wouldn't be "saying to Google" that www.domain.com/a its the same page, but different version as m.domain.com/a.

Using alternate media you are telling google that it is the alternate version, not a completely different page; something similar to what happens with hreflang and domain.com / domain.co.uk / domain.de, or with canonical urls

Hi, some time ago I have read that there is a limit of 50.000 URLs per sitemap file (So, you need to create a sitemap index and separate files with 50.000 urls each). [Source]. Now we are about to implement the link hreflang in the sitemap [Source], and we dont know if we have to count each alternate as a different url.

We have 21 different well positioned domains (Same name, different cctlds, a little different content [varies in currencies, taxes, some labels, etc] depending in the target country) so the amount of links per url would be high.

A) Shall we count each link alternate as a separate url, or just the original ones? For example, if we have to count the link alternates, that would make us have 2380pages per sitemap, each with one original url and 20 alternate links. (Always being aware of the 50mb maximum filesize)

B) Actually we have one sitemap per domain. Using this, shall we generate one per domain using the matching domain as original url? Or it would be the same if we upload to every domain the same sitemap?

Thanks

Hi!

We have a desktop version of our site at http://www.domain.com, and some weeks ago, we launched a mobile edition at http://m.domain.com, replicating the most important sections of the site, but not yet all of them.

Actually, if you access with a mobile device userAgent to any desktop url you are redirected to the home of the mobile web. This is the only redirect implemented about mobile and desktop versions.

A) Shall we also redirect "Googlebot-Mobile" to our mobile site, or it could be considered cloaking?
B) Its necessary to implement the rel="alternate" media="handheld" tag in all of our Desktop SEO URLs? And in our mobile ones? Can't it be implemented via sitemaps like the rel="alternate" hreflang="x" tag?
C) Would the linkbuilding job done on the Desktop version affects the Mobile also, or we would still need to do a separate job?

Thanks!

I have a website with lots of traffic and sometimes the backends fail. I want to use lighttpd to show that the website is under mantenence and should be back up shortly.

I was thinking of using Soft 503 errors or doing a 302 for every page to /maintenance.html.

What would you do (besides fixing the backends, we are already doing that :P) to avoid hurting your SEO efforts?

Thanks in advance

Mariano