[Nepomuk] Re: dolphin faceted search under Kubuntu/KDE 4.6 RC2

Tue Jan 11 23:38:36 CET 2011

It's funny I had not built anything from source before (on KDE Linux I
mean) but I'd come to understand I would do cmake, followed by make
install (correct?)

But I was getting some weird error running cmake and in the course of
trying to install different/latest kde developer libs, I accidentially
removed some things I hadn't meant to (kdelibs-bin - ouch!).

And after reinstalling a bunch of stuff it's working! :)

At least the faceted search part where you can click on the filter
checkboxes for tags an so forth and the search results automatically
change.

One small point of feedback:  Have you noticed that if you're browsing
a high level folder, click one of those checkboxes, are automatically
switched to "find mode" (if that's the right name for it), with the
results appropriately limited, and then you *uncheck* the thing you'd
checked such that no filter checkbox is checked, it wants to start
searching and displaying literally every file beneath the folder you
were on.  Not sure what the alternative UI flow would/should be, but
it's definitely surprising the first time you do that...  you start
seeing a huge number of thumbnails populating (I almost feel the
better behaviour would be not to search in that scenario i.e. where
nothings in the search box and nothing's checked).

On a different note:  I could not get the SPARQL search to work in
either the location box or the search field (wasn't sure which was
right so tried both).  i.e. The example like:

  nepomuksearch:/?sparql=select ?r where {{?r nao:hasTag
<nepomuk:/semanticweb>} UNION {?r nao:hasTag <nepomuk:/test>}}

But maybe that's not a part of what KDE 4.6 is including?

I also did a quick try with sopranocmd and got no results with e.g.:

   sopranocmd --dbus org.kde.NepomukStorage --model main list "" ""
"<nepomuk:/foobar>"

But did I understand correctly that "foobar" in the above example is
the name of an entered tag?  So I'd simply had some tags of "test" and
I was trying:

   sopranocmd --dbus org.kde.NepomukStorage --model main list "" ""
"<nepomuk:/test>"

There were no errors btw just no results returned.  I bet I'm
misunderstanding something...

Lastly just a moment ago I tried a SPARQL query through sopranocmd and
I'm tickled that worked:

    sopranocmd --dbus org.kde.NepomukStorage --model main query
"select ?r where { ?r nao:hasTag ?tag . ?tag nao:prefLabel
'test'^^xsd:string . }"

Returned:
r -> <nepomuk:/res/14a10309-4414-41da-8f79-d8df51c0e62a>
r -> <nepomuk:/res/3f320a70-d9d6-4c44-a624-b5fdd87a4d00>

Though I had not expected the GUID style resources I thought the
actually file path might have been the URI for the resource?  I guess
there's another RDF predicate for the actual file path?

If I can export the data as rdf/xml for me that would be ideal.  I
might even throw something like AllegroGraph (Gruff) on it where I
could see the graph to teach myself better the Nepomuk ontology.

My only other question at the moment is if dolphin's tagging features
are expected to let you use "tags" with values if you like (I
understand Fickr calls those "machine tags"?)   e.g. I have a bunch of
documents about products for sale and I want to "tag" them with the
price.  I was reading on Flickr people had kind of evolved their own
conventions and put e.g. "price=75" as the value of the "tag".  Would
this be what you'd expect with dolphin in it's current KDE 4.6
incarnation?

(i.e. maybe this is an area that might be enhanced assuming that's the
only way right now?  e.g. what you'd really want would be a way for
the faceted stuff to have an actual price field(s) for them to search
with)

Thanks again - I'm starting get encouraged,

Darren

On Tue, Jan 11, 2011 at 10:55 AM, Sebastian Trüg <trueg at kde.org> wrote:
>
> Search will only get you results once the file indexing is finished.
> Please install the nepomukcontroller from kde-apps.org to see the
> indexer status.
>
> Cheers
> Sebastian
>
> On 01/11/2011 04:48 PM, Darren Cruse wrote:
> > </>I was just clicking the Find button, and in the find field (with the
> > "Filename" - versus "Content" button selected at the top) I was simply
> > entering the names of files I knew were there.  With Nepomuk disabled
> > that will show matches but with Nepomuk enabled it always comes back
> > empty with no matches.
> >
> > When I saw your message just now I googled a little and was looking at:
> > http://wiki.mandriva.com/en/Nepomuk_how-to
> >
> > <http://wiki.mandriva.com/en/Nepomuk_how-to>From what I saw there I
> > decided to quickly see what it would do with the SPARQL example shown there:
> >
> >
> > nepomuksearch:/?sparql=select ?r where {{?r nao:hasTag
> > <nepomuk:/semanticweb>} UNION {?r nao:hasTag <nepomuk:/test>}}
> >
> >
> > Where I's assigned the tag "test" on a few files (and that much does
> > seem to be working btw).  Usually trying that also returns nothing.
> >  Though I've also seen an error come back at the bottom don't know if
> > that's helful:
> >
> >
> > Could not start process:  Unable to create io-slave
> >
> > klauncher said:  Unknown protocol ''.
> >
> >
> > On Tue, Jan 11, 2011 at 8:23 AM, Sebastian Trüg <trueg at kde.org
> > <mailto:trueg at kde.org>> wrote:
> >> What did you search for in "basic search"?
> >>
> >> On 01/11/2011 02:18 PM, Darren Cruse wrote:
> >>> I've installed the KDE 4.6 RC2 package (released last week) on Kubuntu -
> >>> this release includes Nepomuk and the faceted search in dolphin.
> >>>
> >>> I've enabled Nepomuk under the Desktop Search system settings, as well
> >>> as the Strigi indexer.
> >>>
> >>> And though basic search seems to work, as soon as I click on any of the
> >>> "Filter" widgets on the right, i.e. "Documents", "Images", "Anytime",
> >>> "This Year", etc. the search results disappear.  At least until I click
> >>> the back arrow or close the Find to get back to normal browsing.
> >>>
> >>> The best clue I have that something (maybe?) isn't installed right is
> >>> that I can see a stream of the following messages if I've started
> >>> dolphin from an xterm:
> >>>
> >>>     "/usr/bin/dolphin(2431)" Soprano:
> >>> "org.freedesktop.DBus.Error.ServiceUnknown - The name
> >>> org.kde.nepomuk.services.nepomukstorage was not provided by any .service
> >>> files"
> >>>
> >>> Hoping maybe this rings a bell for someone.  I've googled and found
> >>> various references to this error on various forums, but I haven't been
> >>> able to figure out why it's happening for me.
> >>>
> >>> Thanks again,
> >>>
> >>> Darren
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Nepomuk mailing list
> >>> Nepomuk at kde.org <mailto:Nepomuk at kde.org>
> >>> https://mail.kde.org/mailman/listinfo/nepomuk
> >> _______________________________________________
> >> Nepomuk mailing list
> >> Nepomuk at kde.org <mailto:Nepomuk at kde.org>
> >> https://mail.kde.org/mailman/listinfo/nepomuk
> >>
> >