How to use "semantic desktop" (nepomuk search)?

[Jose Ildefonso Camargo Tolosa]

Greetings,

After investing a lot of time and system resources, I'm beginning to
wonder if it really worth to have file indexing enabled.... or maybe,
I just don't know how to use it.

I have file indexing enabled, and, as far as I know, I should type in
some words on the search box on Dolphin, and I should get search
results related to the words I entered, right? well, I can't
understand why when I type in (for example) 201203 (to get some files
that *I know* includes that string on the name), I get, in addition to
these files, A LOT of unrelated files (some .mp3 files, some videos,
even plain text files that doesn't have that string anywhere!).

Please note I'm searching for filename, not content, so: it shouldn't
include files that doesn't have the search string on its name.

Has anybody around here used this search system correctly? also, do
you have any pointers that can help me better understand this?

Thanks!

Ildefonso