[Fiware-ngsi] Semantic Extension of the the PubSub GE

[Rolando Sergio (Guest)]

Hi Fano,
In our implementation "scope" in CtxML is equivalent to NGSI "attributeName", and attributeDomainName has no correspondence in CtxML (and probably will never have).
This choice was made for many reasons, the primary because the couple (entity,attributeName) is the key for updating/retrieving context elements, exactly as for CtxML couple (entity,scope), and attribute domain is (only) an optional value which aims to group different attributes which could be related in some ways.
Furthermore, attributeName usually groups together context infos which have a meaning only as an atomic entity.
For example: attributeName=position --> contextValue=["lat":..., "lon":...]
A single "lat" or "lon" value is not enough to specify a "position", it is not interesting to be able to update "lat" and "lon" separately.

It is also true that in many FIWARE use cases, related to IoT and sensors, we deal with simple context values, as could be for "temperature" attribute, e.g.: attributeName="temperature" --> contextValue=25 (assuming an implicit unit), but the assumption attributeName<->scope could be OK in any case.

Best regards,
Sergio


-----Original Message-----
From: fiware-ngsi-bounces at lists.fi-ware.eu [mailto:fiware-ngsi-bounces at lists.fi-ware.eu] On Behalf Of fano.ramparany at orange.com
Sent: mercoledì 6 febbraio 2013 11.31
To: Fermín Galán Márquez; Moltchanov Boris; ARTUSIO Laurent OLNC/OLPS
Cc: fiware-ngsi at lists.fi-ware.eu
Subject: Re: [Fiware-ngsi] Semantic Extension of the the PubSub GE

Hi Fermin Boris and all,

Thank you for renaming this thread (I've removed the word last "semantic"  which was a typo from my side).
Thank you for the clarification you brought. In my current understanding the "scope" element in the ContextML language correspond to the "attributeDomainName" in the NGSI data structure representation. Could you give your opinion about this Boris?

Regards,

Fano


-----Message d'origine-----
De : Fermín Galán Márquez [mailto:fermin at tid.es] 
Envoyé : mardi 5 février 2013 18:40
À : Moltchanov Boris; RAMPARANY Fano OLNC/OLPS; ARTUSIO Laurent OLNC/OLPS
Cc : fiware-ngsi at lists.fi-ware.eu
Objet : Semantic Extension of the the PubSub GE semantic

Dear Boris, Fano, Laurent,

I think this discussion is interesting (and, we have a change I will read the emails on deep and try to provide feedback). However, in order to keep email threads clean, I have renamed its subject, so we can leave the "JSON" subject for emails actually related with the discussion on NGSI JSON (if any).

Thanks in advance!

Best regards,

------
Fermín

El 05/02/2013 11:42, Moltchanov Boris escribió:
> Dear Fano,
>
> I'm here just to give few clarifications about the semantic meaning in the TI's implementation of the Pub/Sub GE.
>
> a. currently the broker does not support the application domain 
> meta-data neither in its data structure nor in the requests;
>
> b. once the NGSI-9 (context providers operations and in particular 
> registry) will be implemented we're going to enable to NGSI providers 
> to claim to the broker what the applications domain context they are 
> running; therefore for those providers the broker will know what is 
> the application domain at the registration phase. And any requests 
> coming from a consumer (the SPARQL converter as well) will be treated 
> regardless of the application domain within the request but the 
> application domain of the provider, which will return requested 
> context data (NGSI "scope" value) with its own assigned application 
> domain;
>
> c. no specific dynamic application domains will be supported by the ContextML/CQL therefore we're prone to assign any by default in our wrapper (on in SPARQL converter) or assign it by the broker instance's configuration.
>
> If you need any clarifications or further details please let me know.
>
> Best Regards,
> Boris
>
> -----Original Message-----
> From: fiware-ngsi-bounces at lists.fi-ware.eu 
> [mailto:fiware-ngsi-bounces at lists.fi-ware.eu] On Behalf Of 
> fano.ramparany at orange.com
> Sent: Monday, February 04, 2013 7:44 PM
> To: Fermín Galán Márquez; fiware-ngsi at lists.fi-ware.eu
> Subject: Re: [Fiware-ngsi] JSON
>
> Hi,
>
> In the context of the development of the semantic extension of the the PubSub GE semantic, we are developing a NGSI/XML to RDF/XML translator. To start with we are focusing on the NGSI/XML queryContextResponse...xml messages related to geolocation. We plan to use the "attributeDomainName" element as an hint to identify a geolocation context information.
>
> We have a first question about this: is there a reason for introducing 2 different values of this element related to geolocation? Namely: parcelGeo, geolocation? Why don't we simply use geolocation?
>
> More generally, could we assume that the value of the "attributeDomainName" could be used as a way to anticipate what the "contextAttribute" names (in the "contextAttributeList") will be?
>
> If it is the case, we can use this element to identify which ontology the target rdf will comply to and to use the corresponding "contextAttribute"s names as properties of the ontology or to find in an existing ontology the mapping between the properties of this ontology and the "contextAttribute" names.
>
> Apart from geolocation, in the examples we have found messages tagged with "parcelStep" "attribute DomainName". We assume that we should elaborate the corresponding RDF in compliance with some supply chain ontology.
>
> It would be interesting to do this translation exercise, with more NGSI/XML examples coming from UC projects which are using the PubSub GE, although the policy we currently foresee is that each UC project define its domain ontologies and we supply the project with a method to automate the transformation of the NGSI/XML content into RDF complying to this domain ontology.
>
> Any feedback on this is more than welcome,
>
> Thanks,
>
> Fano
>
> -----Message d'origine-----
> De : fiware-ngsi-bounces at lists.fi-ware.eu 
> [mailto:fiware-ngsi-bounces at lists.fi-ware.eu] De la part de Fermín 
> Galán Márquez Envoyé : mercredi 30 janvier 2013 15:32 À : 
> fiware-ngsi at lists.fi-ware.eu Objet : [Fiware-ngsi] JSON
>
> Hi,
>
> We have a bunch of XML examples for our NGSI binding at 
> https://forge.fi-ware.eu/scmrepos/svn/iot/trunk/schemes/xml_examples/
> but, what about JSON? Is there any similar bunch of example available in some place, please?
>
> Thanks!
>
> Best regards,
>
> ------
> Fermín
>
>


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