I have some documents that are not as important and I would like to have a lower priority for them.
If I generate a sitemap I can set the priority for these pages to a lower value, e.g. 0.1. According to the official spec (http://www.sitemaps.org/protocol.html) the default is 0.5 so if I don't specify a priority it should be considered the default, i.e. 0.5.
What if I would only include the pages that need tweaking in the sitemap and leave out all other pages on the site. What would that do to the ranking of the "normal" pages and the ranking of the site?