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Re: thing description question

From: Michael Koster <michael.koster@smartthings.com>
Date: Thu, 21 Apr 2016 14:52:25 -0700
Cc: Soumya Kanti Datta <Soumya-Kanti.Datta@eurecom.fr>, Public Web of Things IG <public-wot-ig@w3.org>
Message-Id: <B077958A-1AEC-41A0-AEE2-52F0B006076E@smartthings.com>
To: "Charpenay, Victor" <victor.charpenay@siemens.com>
Resource Directory stores links to resources (could be objects), using RFC 6690 CoRE Link Format. 

Resource Directory could be used to store Thing Descriptions, as long as they are serialized to a format compatible with RFC 6690 or one of it's alternate serializations, for example link-format+json or link-format+cbor.

https://tools.ietf.org/html/draft-ietf-core-links-json-04 <https://tools.ietf.org/html/draft-ietf-core-links-json-04>

For example, I've attached an example serialization of the TD example 11 from the Current Practices document sec., which could be made compatible with CoRE link-format+json processors. 

This currently has 2 issues; first the "@" character isn't allowed in link header encoding (but could be processed as JSON just fine). Also, having a map as a link extension value is not representable in link header encoding, so may need to be string encoded if not represented in JSON or CBOR.

Also, "rd-lookup" is an optional function in CoRE RD. An extension could be a "rd-sparql" service that maps SPARQL queries to uri-query parameters.

Best regards,


> On Apr 21, 2016, at 7:14 AM, Charpenay, Victor <victor.charpenay@siemens.com> wrote:
> Hi Soumya,
> could you give us a link to those guidelines? From what I found, they consist in using a CoRE Resource Directory to store objects but it seems rather straightforward since LwM2M and IPSO objects are RESTful by design. Maybe there is more?
> Anyway, isn't the Thingweb Repository an implementation of what you are looking for? By the way, the idea of a Thing Repository had been questioned (shortly before Nice), since it seems very similar in spirit to a Resource Directory. Yet, it provides a SPARQL interface, which covers and extends by far the query mechanism of a Resource Directory.
> Regards,
> Victor
> -----Original Message-----
> From: Soumya Kanti Datta [mailto:Soumya-Kanti.Datta@eurecom.fr] 
> Sent: Donnerstag, 21. April 2016 11:42
> To: public-wot-ig@w3.org
> Subject: thing description question
> Hi,
> With the semantic based TD, how can we use it for automatic management of things? If you see IPSO alliance or OMA LwM2M - they provide guidelines on how to use CoRE Link Format for TD and utilize that for management.
> Did someone from TF-TD alrady investigate into this.
> Thanks,
> Soumya
> --
> Research Engineer, EURECOM, France | +33658194342 | @skdatta2010 | https://sites.google.com/site/skdunfolded | Skype id: soumyakantidatta

Received on Thursday, 21 April 2016 21:52:57 UTC

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