hj:1346842081 wrote
If I clear the cache (dokuwiki/data/cache) completely, of all files and folders, will dokuwiki rebuild these on the next useage? Will it rebuild all the files (_dummy, messages.txt, purgefile, sitemap.xml.gz) and all the folders 1-9 and a-f that I currently have?
I'm relatively sure that the _dummy file is just for git in order to keep the directory (git doesn't handle empty directories) and that it isn't needed for normal usage (and thus also won't be re-added until you upgrade DokuWiki).
messages.txt is for the update notifications, it will be re-added (I think immediately on the first request or on the first request of an admin, it's downloaded from dokuwiki.org), purgefile is a timestamp for making the cache checks a bit faster in some cases, I think it will be re-added when you change a page. sitemap.xml.gz will either be re-added from the indexer script or when the sitemap is requested by a search engine (whatever comes first). So all in all I think it should be okay to delete them, but I also don't see a reason to delete them.