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My sitemap is 2.5 meg. To save on bandwidth, I compressed it with to a .gz extension. In one of the examples on the google site, it shows a sitemap in .gz format.
When I submit mine, it did indicate there was a parasing error.
Can anyone confirm if they have been able to submit one successfully in this format. For now, I have resubmitted mine in .xml format.
I found out that the php script that I am using gives an html output when run with the sitemap. Rather then saving the results into a text file with an xml extension, which is what I did, the author advised to simply submit the url to the php script as my sitemap.
This way google would always have a fresh sitemap...Once I did that, I did get a message from google saying successful submission