Hi Pantelis,

Just to add - if I understood right, it might require some work to parse non
- OntModel into ToxOtis internal objects, but what I would be interested is
the time to parse the incoming stream into Jena model only, ignoring further
transformations for the time being.

Do you think this kind of measurement is feasible?
Nina

On Wed, Oct 6, 2010 at 6:17 PM, Nina Jeliazkova
<jeliazkova.nina at gmail.com>wrote:

> Hi Pantelis,
>
> There is no problem of parsing OWL-DL with Jena models (recall OWL-DL is a
> valid RDF) , different than OntModel.
>
> You will only loose some convenient methods and classes in Jena, but you
> can still check if a class has certain rdf:type or certain properties.  I
> agree the client code might became less elegant , but performance gain may
> worth it.
>
>
> On Wed, Oct 6, 2010 at 6:08 PM, chung <chvng at mail.ntua.gr> wrote:
>
>> Hi Nina, Egon,
>>   That would be an interesting experiment in general but there are some
>> technical problems related to ToxOtis and to the current format of our
>> RDF documents. First of all, a common RDF specification has been chosen,
>> that is OWL-DL and we have lots of times striven to stick to it. ToxOtis
>> produces OWL-DL compliant RDF representations for every OpenTox entity
>> (methods asIndividual(OntModel):Individual and asOntModel():OntModel ).
>> OntModel and OntClass have been chosen as the prime Jena objects to work
>> with in ToxOtis and in YAQP, our web application also. Apart from the
>> fact that it would be hard to change that, I also reckon we shouldn't
>> for various reasons I'll try to summarize.
>>
>
>
>   OntModel is an interface that offers lots of functionalities such as
>> creation of Annotation, Datatype and Object Properties that are missing
>> from the interface Model where one can just use m.createProperty(String)
>> to create an untyped property. Additionally, OntModel is tightly
>> connected to OntClass, an interface used to describe the ontological
>> classes to which instances are binded. So if we need to produce OWL-DL
>> compliant representations we either need an implementation of OntModel
>> and OntClass provided by Jena or one of ours. My opinion is that the
>> adoption of OWL-DL against OWL-Full or OWL-Lite does not increase
>> significantly the size of the representation. What is more, OWL-DL
>> guarantees computability and decidability and does not oblige users to
>> use some inference engine that imposes overhead so it would be better to
>> cling to it both for the server and from the client side.
>>   As you already know, using OntModel we have performed measurements to
>> compare between different specifications and it was shown that OWL-DL
>> performs better for parsing documents compared to OWL and OWL-Lite. What
>> might be of interest is to reveal the impact of the cache size (for in
>> memory triple storage) on the performance of RDF parse/serialization
>> procedure and on the allocation of resources.
>>
>> Best Regards,
>> Pantelis
>>
>> On Wed, 2010-10-06 at 15:12 +0200, Egon Willighagen wrote:
>>
>> > Pantelis,
>> >
>> > On Wed, Oct 6, 2010 at 2:58 PM, Nina Jeliazkova
>> > <jeliazkova.nina at gmail.com> wrote:
>> > >> Would it be hard for you to switch to "plain" RDF (i.e.  omit all
>> > >> RDF:type statements) and compare computation times with OWL
>> > >> representations.
>> > >
>> > > From dataset service point of view it is practically impossible,
>> without
>> > > breaking everything,  but form client point of view one can try using
>> Jena
>> > > models, different than OntModel.
>> >
>> > what happens if you use either of these:
>> >
>> > ModelFactory.createDefaultModel()
>> > ModelFactory.createNonreifyingModel()
>> >
>> > ?
>>
>>
>> If you think this is necessary, we can set up an experiment without
>> ToxOtis...
>>
>
>
> Yes, please (unless it is a month work...)
>
> Best regards,
> Nina
>
>
>
>
>>
>> >
>> > Egon
>> >
>>
>>
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>
>
>