RE: I am interested in Semantics and Sensors.

Hello Michael

We don't store the semantic information from sensors. We generate it on demand.

The format of the semantic information generated, depends on the Accept header of the request. We can generate RDF, Turtle, HTML, XML, JSON, CSV or Text, either directly from the RDF sources, or from the SPARQL endpoint.

Sincerely,
Peter Waher


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From: Michael Koster [mailto:michaeljohnkoster@gmail.com]
Sent: den 26 februari 2013 12:30
To: Peter Waher
Cc: Frank Haferkorn; public-ssn-cg@w3.org
Subject: Re: I am interested in Semantics and Sensors.

Hello Peter,

Do you store the sensor data values in RDF or do you point to a JSON or XML object?

Thanks,

Michael

On Feb 26, 2013, at 6:55 AM, Peter Waher <Peter.Waher@clayster.com<mailto:Peter.Waher@clayster.com>> wrote:


Hello Frank

In our system (running on servers or plug computers, gateways, etc.), semantic data for all connected sensors is generated on the fly (on demand). It has a built in SPARQL engine which can process a variety of RDF triple sources. One such type of triple source is an on demand converter of sensor information to semantic information. As we control the SPARQL engine ourselves, we don't have the need to create a huge triple store for all semantic data necessary to describe the sensor network.

Sincerely,
Peter Waher

From: Frank Haferkorn [mailto:F.Haferkorn@RST-Automation.de<http://RST-Automation.de>]
Sent: den 26 februari 2013 07:16
To: public-ssn-cg@w3.org<mailto:public-ssn-cg@w3.org>
Cc: Peter Waher
Subject: AW: I am interested in Semantics and Sensors.

Dear SSN team,

I was able to browse

http://www.w3.org/2005/Incubator/ssn/ssnx/ssn

and got an impression of the SSN ontology.
I learned about the description of sensor data and other interesting items like observation etc. .

But I still have a big Question:
HOW IS THE REAL ACCESS of the Sensor's Data implemented.
In my Eyes there are only three possible ways:
*         Pushing - the sensor is updating the related semantics itself,
*         Polling - there is some software entity that is polling the and creating the semantic data from the sensor's output?
*         Triggering - The semantic data is generated on the fly at the moment of the request for the data.

Which option is used in real SSN systems?

Yours,
  Frank Haferkorn


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