[Fiware-ngsi] Association in NGSI

[fano.ramparany at orange.com]

Thank you for your proposal Tobias,

I've got few questions about the "Sensor_123->Room_A" association example:

-          What is are the semantics of the associations "Sensor_123->Room_A" and "Sensor_123->Room_B". Is there a reason why you don't capture this semantics in the name of the metadata?

-          What is the relationship between Room_A and Room_B if any

-          In this example there is a single element in the entityIdList. In case there are multiple elements, should they all be temperature sensors.

-          In this example there is a single contextMetaData element in the metaData "section".  In case there are multiple contextMetaData elements, would they represent different type of measurements that the "sensor_123" could yield (sensor producing multiple readings)

-          In this example there is a single contextMetaData element in the registrationMetatData "section". In which cases several contextMetaData elements could be necessary?

-          Is there a reason for distinguishing the registrationMetaData section from the contextRegisrationAttributes.metaData section?

-          Which Java API do you use to process NGSI XML messages. In particular, we've got problem in understanding how JAXB handles the "anyType" type declaration of the "value" element for the "ContextMetaData" type. (this echoes a previous mail I posted on this list)

Thank you,

Fano

De : fiware-ngsi-bounces at lists.fi-ware.eu [mailto:fiware-ngsi-bounces at lists.fi-ware.eu] De la part de Tobias Jacobs
Envoyé : vendredi 1 mars 2013 12:10
À : fiware-ngsi at lists.fi-ware.eu
Objet : [Fiware-ngsi] Association in NGSI

Dear all,

As promised, we have worked out a concept to represent associations between context entities in NGSI.

This is an important feature of the IoT Backend, and in particular relevant for the interaction between Configuration Management and IoT Broker.

If you are interested in this topic, please read our draft at
https://forge.fi-ware.eu/plugins/mediawiki/wiki/fi-ware-private/index.php/OMA_NGSI_Association_concept.
It is a rather short document.

I am looking forward to the discussion about this topic :)

Best regards
Tobias

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