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[wot-architecture] minutes - 14 January 2021

From: Kazuyuki Ashimura <ashimura@w3.org>
Date: Wed, 27 Jan 2021 19:05:00 +0900
Message-ID: <878s8e1yr7.wl-ashimura@w3.org>
To: public-wot-wg@w3.org
available at:

also as text below.




      [1] https://www.w3.org/

                            WoT Architecture

14 January 2021

   [2]Agenda. [3]IRC log.

      [2] https://www.w3.org/WoT/IG/wiki/WG_WoT_Architecture_WebConf#Jan._13th.2C_2021
      [3] https://www.w3.org/2021/01/14-wot-arch-irc


          Cristiano_Aguzzi, Daniel_Peintner, Kaz_Ashimura,
          Michael_Koster, Michael_Lagally Michael_McCool,
          Ryuichi_Matsukura, Sebastian_Kaebisch, Tomoaki_Mizushima





    1. [4]Agenda
    2. [5]Prev minutes
    3. [6]Terminology

Meeting minutes


   Lagally: (goes through the agenda)

  Prev minutes


      [7] https://www.w3.org/2020/12/17-wot-arch-minutes.html

   Lagally: (goes through the minutes)
   … was a clean-up call
   … any concerns?




   Lagally: we started discussion during the main call yesterday,
   Jan 14

   [8]Issue 453

      [8] https://github.com/w3c/wot-architecture/issues/453

   Lagally: would be great if somebody could generate a MR for

   McCool: we have to think about if partial TD should include
   mathematical definition
   … whether regular TD is also a partial TD or not

   Cristiano: wondering about the relationship with "TD fragment"

   Lagally: let's start with "Partial TD" first and then talk
   about "TD fragment" later

   Daniel: wondering about "Thing Model" as well
   … what is what
   … and what is subset of what

   Lagally: (shows the terminology section of the Architecture ED)

   [9]3. Terminology

      [9] https://w3c.github.io/wot-architecture/#terminology

   Lagally: there is a definition for "Thing Model"

   <mlagally> [10]https://w3c.github.io/

     [10] https://w3c.github.io/wot-architecture/#terminology


   Thing Model

   A Thing Model is a description for a class of Things that have
   the same capabilities. It describes the Properties, Actions,
   and Events and common metadata that are shared for an entire
   group of Things. Compared to a Thing Description, a Thing Model
   does not contain enough information to identify or interact
   with a Thing instance.


   McCool: how to relax the restriction?

   Lagally: here we made some definition for "Thing Model"
   … Compared to a Thing Description, a Thing Model does not
   contain enough information to identify or interact with a Thing
   … Thing Model is some kind of data model we define by the Thing
   Description spec

   McCool: partial TD is just relaxing the requirements for TD
   … compared to a full TD

   (some more discussion)

   McCool: we need to look into use cases

   Lagally: partial TD is used for the Scripting API

   Daniel: I did mention that, but Cristiano may have a bit
   different view

   Kaz: I also think we should continue the discussion based on
   some concrete use cases with some concrete TD (or partial TD or
   TD fragment or TD model)

   Lagally: that's correct

   Lagally: and would like to see the difference with each other

   Cristiano: TD fragment is a piece of TD

   Lagally: (adds Cristiano's point to the issue comment)
   … TD fragment is...

   McCool: to me, TD fragment is a piece of insight

   Lagally: (adds comments)
   … TD fragment is a substructure of the data model of a TD
   … in JSON representation it could be just an inner structure
   omitting outer elements, curly braces, etc.

   McCool: it's still a valid as JSON

   Lagally: valid JSON, however could be just an inner structure
   omitting outer elements

   <Zakim> dape, you wanted to illustrate scripting example

   Daniel: wanted to show some example


     [11] https://github.com/eclipse/thingweb.node-wot/blob/62106f4978d88a7cf70f3333ba801f00cdf4d929/examples/scripts/counter.js#L26-L127

   Lagally: it's not a TD fragment but partial TD. right?

   Daniel: yes


   count: {

     type: "integer",

     description: "current counter value",

     descriptions: {


         "en": "current counter value",

         "de": "Derzeitiger Zähler Stand",

         "it": "valore attuale del contatore"


       "iot:Custom": "example annotation",

       observable: true,

       readOnly: true




   Lagally: it's a valid object structure can be validated

   McCool: yes
   … and valid JSON syntactically

   Lagally: we need some additional constraints for this

   McCool: we have big discussion for Discovery about this
   … TD fragment is useful for Discovery results
   … do we have any additional constraints?

   Lagally: anyway it's validatable

   McCool: possibly missing parts there

   Lagally: (adds some clarification)
   … (and also shows the TD Editor's Draft)

   [12]ED of TD spec

     [12] https://w3c.github.io/wot-thing-description/#sec-vocabulary-definition

   Lagally: constraints with the TD Information Model?

   Cristiano: we could say constraints with the JSON Schema

   Lagally: TD fragment is useful for Discovery results

   McCool: results returned by a JSON Path query

   Lagally: (adds that point to the Issue comment)

   McCool: maybe we could make that part of the note a use case

   Lagally: fine with that use caes?

   Kaz: yes
   … and nicer to have an actual TD fragment example as well

   McCool: we could borrow that from Farshid's description

   Lagally: (shows the Discovery ED)

   [13] Syntactic search: JSONPath

     [13] https://w3c.github.io/wot-discovery/#jsonpath-semantic

   McCool: ah, we need to expand that section to include the

   Lagally: (also shows the terminology section)

   [14]3. Terminology from the WoT Discovery ED

     [14] https://w3c.github.io/wot-discovery/#terminology


   Partial TD

   A data model partially conformant to the Thing Description
   schema by including only a subset of the attributes.


   sk: don't like the term of "attributes" there
   … would be better to say "information model", etc.

   McCool: partially conformant is a bit ambiguous
   … conformant to the entire information model
   … or subset of the information model

   Lagally: ok
   … let's remove "partially" from the definition here
   … (adds some more clarification to the definition of "Partial
   … subset of a TD information model which doesn't require all
   mandatory eleents of the TD.
   … It is including only a subset of the terms of the TD
   information model
   … A data model conformant to the TD schema can be validated by
   alidating th subet of elements that are present.
   … (adds a note)
   … when seralized a partial TD includes all outer elements of a
   TD but may omit internal elements.

   Lagally: a partial TD is used for the Scripting API
   … TODOs
   … need examples from the Scripting API and the Discovery specs

   <McCool> (have to drop, sorry...)

   [15]updated comments including the draft definitions

     [15] https://github.com/w3c/wot-architecture/issues/453#issuecomment-760290680

   Kaz: I'm OK with the above draft definitions
   … but maybe we could think about "what can be omitted from the
   entire TD information model for "Partial TD" and "TD Fragment"
   … for example, the SSML 1.1 spec had a definition for
   "Fragments" by mentioning namespace definitions (other than
   xml:lang and xml: base) can be omitted

   [16]SSML 1.1 - 2.2.1 Conforming Speech Synthesis Markup
   Language Fragments

     [16] https://www.w3.org/TR/speech-synthesis11/#S2.2.1

   Kaz: anyway, we need to continue the discussion about the
   definitions based on actual use cases and examples


    Minutes manually created (not a transcript), formatted by
    [17]scribe.perl version 127 (Wed Dec 30 17:39:58 2020 UTC).

     [17] https://w3c.github.io/scribe2/scribedoc.html
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