Hello, currently it is not possible to access recent files in Nepomuk, instead the history is locked to concrete dates. Which is'nt useful at all for the normal workflow (only useful for the Journal in GNOME or similar). Why? With "today" you have to populate this list from start every day again and again, this can also happen during your worktime (when you work past midnight). "Yesterday" is basically the same and doesn't help you at all when it is Monday and you want to continue your work from last week (or just any day before yesterday). My idea is to add a timeline:/recent "folder" which filters the history by: 20 last used (ie. recent) documents and folders. AND 7 days of last used documents and folders. So the list would have never more than 20 entries and less if you opened less than 20 files in the last 7 days (I guess you get the idea). Ideally the number of documents and days would be set in a config-file in the user space, so it can be tweaked by the user to their needs. IMHO this is a VERY COMMON AND BASIC functionality and I'm a bit disappointed and astonished that this isn't provided or even thought about... :-/
On a second thought: It would be better to have no time constraint at all in timeline:/recent. It should just be populated by the 20 (configurable) most recent documents. This way it would be possible to come back from holiday and begin right from where one left, instead of digging through the timeline. And for timebased history there will hopefully be other folders, such as lastday, lastweek, lastmonth, etc...
Thank you for taking the time to file a bug report. The Nepomuk project is no longer included in the KDE Software Compilation. With Plasma 5, we have replaced most of the underlying technology with Baloo and other components. Hopefully this will have addressed your concern. We encourage you to try out Plasma 5 (+Baloo) and let us know if your problem persists.