1 There are a few special database {meta} field names used thoughout ewiki
2 and its plugins. This description tries to collect and summarize them.
5 $meta["class"] groups db entry / page into technical categories,
6 "temp", "calendar", "cache", "plugin", ...
8 $meta["kill-after"] entry which shall be removed after given date
9 automatically (by cron.d/ scripts), used for
10 temporary and cache entries, just a time() value