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I have a fairly large site, with a lot of static AND dynamic pages. I have never created an xml site map for this site (have used them on smaller or new sites) as was concerned about getting it complete enough.
My main question - is a partial or complete sitemap useful or harmful? Is it ok to create a sitemap that lists the static pages and let Google find the dynamic pages that lead on from there?
Having updated and significantly added to one area of the site, I would like to encourage Google to update it's index of the relevant pages. The Google cache of one particular page that is now much more important with much more content, is 7 weeks old.
I guess following on from main question I would also ask, is an out of date xml sitemap harmful (ie not listing recent page additions)
So, while I've never done it (at least not intentionally) I can't foresee any problems from a Sitemap that doesn't contain all the site's URLs. If a URL has a link pointing to it, then Google almost always finds it.
The only drawback to not having a URL included in the Sitemap would be that you can't give Google the extra XML information, such as <crawlfreq> suggestions.
In another recent thread here somewhere, someone was asking how you can get Google to spider one particular page. I'm not suggesting a sitemap for one page, but submitting a sitemap for the main pages because one of them needs updating in their index sounds feasible.