Hello

Such a search is possible already today, for instance by using the predefined tag CLASS and introducing a new tag POSITION, for instance. You can introduce any number of tags.

With SPARQL however, you can do disitributed searches and use linked data. So, your search can include conditions on data that reside outside of your data set. You can also perform federated queries. You might, for instance only report the metering location (MLOC tag), but have all information about that metering location in a second database on a second machine. You could then make queries using SPARQL that included condition based on the data stored on the second machine.

But as I mentioned in the previous mail, such searches are already possible, as long as you define a mapping from tag name to corresponding URI (In SPARQL, data items are identified and linked using URIs).

Best regards,

Peter Waher

From: Joachim Lindborg [mailto:joachim.lindborg@sust.se]
Sent: den 13 januari 2015 10:37
To: XMPP in the Internet of Things
Subject: Re: [IOT] Semantic searches in registry

That is very interesting i would like to find all "outside temperatures" 

tisdag 13 januari 2015 skrev Cramer, E.R. (Eelco) <Eelco.Cramer@tno.nl>:

Hi,

I was wondering if anyone has considered of adding semantics to the IoT XMPP specs?

I’m particularly interested in ways to add semantics to the IoT discovery XEP.

Paragraph 5.2 of the XEP (https://xmpp.org/extensions/xep-0347.html#tags) describes a set of meta tags that can be used to describe things as it does put some limits on the values you can set. But I would like to link the meta-data to some sort of semantic ontologies (RDF). I then want to use that data to enable ’smarter’ queries to the registry (ie. sparql like queries).

Is there any known work in this area?

If I have any results of myself in this field I will share it on this list.

Thanks,

Eelco

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Regards
Joachim Lindborg
CTO, systems architect

Sustainable Innovation  SUST.se
Barnhusgatan 3 111 23 Stockholm

Email: Joachim.lindborg@sust.se
linkedin: http://www.linkedin.com/in/joachimlindborg
Tel +46 706-442270

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