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I'm sorry to say Mike above is wrong. He's been deceived by the file name and didn't actually look to see what it did I guess. Our geo_sitemap.xml file is a normal XML sitemap, linking to the KML file, it's not actually a geo sitemap, it's just named that way for historic reasons.
See the first question on this thread and Susan Moskwa's answer: https://plus.google.com/+SusanMoskwa/posts/CmZejMkLN4r
Yeah we might as well ditch that 
but yeah it's crawled as a normal XML file as it doesn't give any errors at all in GWT.
Cool
Small note: get_permalink() will always work, no need to specifically do get_page_permalink()
There isn't really a good way that I know of currently to verify Google has indexed it...