[Nepomuk] Search for specific file types

[Peter Hedlund]

Hi all,

I see as my main use case for nepomuk the ability to create saved 
searches/virtual folders for specific file types (mime types).

Example: locate all pdf files in a folder hierarchy.

The only way I have found that reliably works within Dolphin is to search for 
*.pdf as a filename. It works, but is quite slow.

According to 
http://techbase.kde.org/Development/Tutorials/Metadata/Nepomuk/QueryService it 
should be possible to search for mimeType or fileExtension. I have not been 
able to figure out a syntax that actually works. Is it possible? Would it be 
faster?

I can't help but compare with Spotlight on Mac OS X. Having a saved search for 
the pdf file type within a hierarchy of folders is updated almost 
instantaneously if some new files are added even if the total number of files is 
more than a thousand. In Dolphin as described above the search starts from 
scratch every time and it takes more than a minute to locate 1100 files.

FYI, I am running a fully updated Kubuntu Natty.

Thanks for any input you might have.

Peter