[Nepomuk] Re: Question regarding usage of Nepomuk::Vocabulary::PIMO::hasPart ()

[Christian Mollekopf]

On Friday 29 October 2010 15:47:54 Sebastian Trüg wrote:
> Hi Christian,
> 
> On 10/29/2010 10:38 AM, Christian Mollekopf wrote:
> > Instead of adding an note to a topic with the isPart relation, i added
> > now the topic as property to the note.
> > 
> > The Topic is a Nepomuk::Thing("MyTopic",
> > Nepomuk::Vocabulary::PIMO::Topic())
> 
> this is correct.
> 
> > The note is a Nepomuk::Resource(akonadiItemUri)
> 
> this is ok, too.
> 
> > and i add the property like this:
> > setProperty(Nepomuk::Vocabulary::PIMO::Topic(), Nepomuk::Thing("MyTopic",
> > Nepomuk::Vocabulary::PIMO::Topic()));
> 
> this is completely wrong. You cannot use a class as a property.
> Instead you should use pimo:isRelated() to relate a note to a topic and
> pimo:groundingOccurrence() to relate the note to the akonadi resource.
> Thus, that gives us:
> 
> Nepomuk::Thing note( QUrl(), Nepomuk::Vocabulary::PIMO::Note() );
> Nepomuk::Thing topic( "My topic", Nepomuk::Vocabulary::PIMO::Topic() );
> Nepomuk::Resource akonadiRes(akonadiItemUri);
> note.addGroundingOccurrence(akonadiRes);
> note.addProperty(Nepomuk::Vocabulary::PIMO::isRelated(), topic);

But isn't the Nepomuk::Thing unique for each type?
I mean there are many notes (the grounding occurrences) but only one 
Nepomuk::Thing of the type PIMO::Note().
So if i set then the Nepomuk::Thing related to the topic, this would mean that 
all notes are related to the topic, but I want to relate only one single note 
to the topic.

so can i just do
akonadiRes..addProperty(Nepomuk::Vocabulary::PIMO::isRelated(), topic); 
above code?

> 
> I suppose pimo:isPartOf can be used to model a hierarchy between notes
> or topics. But a note is not actually part of a topic. IMHO that would
> not make sense.

Agreed, i will use it only for the hierarchy then.

Thanks for your help,

Christian

> 
> maybe Leo (the author of PIMO) can tell me if I got the details right.
> 
> Cheers,
> Sebastian
> 
> > I did not yet create the hiarchy of topics, but plan to do so with the
> > isPart relation (could not yet figure out how that works).
> > 
> > The solution i have now works for me, but I wonder if this is the correct
> > way to do things, or if it would make more sense to use the isPart
> > relation.
> > 
> > Cheers,
> > 
> > Christian
> > 
> > On Thursday 28 October 2010 13:53:59 Christian Mollekopf wrote:
> >> Hi,
> >> 
> >> I'm currently prototyping an application for handling
> >> Notes/Tasks/Events. While i use akonadi items for storing the notes,
> >> and the existing akonadi classes is want to use nepomuk to model the
> >> relations between them.
> >> 
> >> I know there are already other efforts in this direction namely kjots,
> >> basket, semnotes, and i will eventually see how to integrate, share
> >> code, merge, or whatever =)
> >> 
> >> For manual organisation I want to use "Topics". I.e this will allow a
> >> treestructure like the notes in kjots, but also allow notes to be in
> >> several "Topics" at the same time.
> >> 
> >> So my understanding of how that should work (i will talk only about
> >> notes for simplicity):
> >> -I create a Pimo::Note resource for each note and set the akonadi uri as
> >> identifier
> >> -I create a Pimo::Thing of the type Nepomuk::Vocabulary::PIMO::Topic()
> >> for each topic
> >> 
> >> For the relation between topics (hiarchy), and adding items to a topic,
> >> i want to use the Nepomuk::Vocabulary::PIMO::hasPart() relation
> >> (respectively isPart() but that is not existing).
> >> 
> >> So for an example hiarchy:
> >> 
> >> "Topic1->Subtopic1->Note1"
> >> 
> >> which would read as:
> >> 
> >> "Note1 isPartOf Subtopic1 isPartOf Topic1"
> >> 
> >> I hope this is the correct way to do things, but my problem is, i don't
> >> understand how to use the Nepomuk::Vocabulary::PIMO::hasPart() relation.
> >> 
> >> Specifically, how can i set Note1 to be part of Subtopic1, and how can i
> >> check if Note1 is part of Subtopic1.
> >> 
> >> A Codeexample would be greatly appreceated.
> >> 
> >> In case it matters:
> >> i found Nepomuk::Vocabulary::PIMO::hasPart() and
> >> Nepomuk::Vocabulary::PIMO::Topic() in pimo.h which i believe is the
> >> ontology?
> >> 
> >> Thanks for you help,
> >> 
> >> Christian
> >> _______________________________________________
> >> Nepomuk mailing list
> >> Nepomuk at kde.org
> >> https://mail.kde.org/mailman/listinfo/nepomuk
> > 
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