Whenever you make changes to you sitemap files you will need to reindex your
sitemap to ensure it is up to date.
If you change your map configuration such as what to include in your sitemap
or the location of files you may also need to reindex your sitemap.
G-Mapper will sometimes ask if you would like to reindex your sitemap files
when you have made changes that my affect the content of your map.
To Reindex your sitemap manually simply click on the Reindex button
on the toolbar and click Go.
G-Mapper creates various sitemap files when exporting and indexing your sitemap.