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13:59:50 <kaz> meeting: Web-based Digital Twins for Smart Cities IG
14:01:17 <kaz> present+ Kaz_Ashimura, Bert_Bos, Michael_Koster, Torbjorn_Lahrin, Hiroki_Endo
14:01:51 <kaz> present+ Kunihiko_Toumura, Frederic_Le
14:02:08 <kaz> present+ Tomoaki_Mizushima
14:02:39 <Bert> scribe+
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14:02:49 <kaz> agenda: https://github.com/w3c/smart-cities/blob/main/README.md#2-march-2026
14:03:00 <ktoumura> ktoumura has joined #smart-cities
14:03:24 <kaz> present+ Juanjo_Hierro
14:04:39 <Mizushima> present+ Tomoaki_MIzushima
14:04:45 <Bert> kaz: How long will the presentation be? 40 mins?
14:05:07 <kaz> topic: Logistics (Guests, Meeting schedule, etc.)
14:05:44 <Bert> ... First some logistics: I'm sharing screen, agenda, three guests.
14:05:49 <kaz> topic: Minutes review: 25 Jan 2026
14:06:03 <kaz> -> https://w3c.github.io/smart-cities/minutes/2026/01/26-smart-cities-minutes.html 25 Jan 2026
14:06:31 <Bert> ... Review of last minutes.
14:06:53 <Bert> ... We take minutes in IRC and then publsih them on GitHub.
14:07:20 <Bert> ... We had some discussions and did some planning.
14:07:29 <Bert> ... Do we approve the minutes?
14:07:34 <Bert> <Bert> +1
14:07:49 <Bert> resolved: minutes approved
14:08:20 <Bert> Kaz: Let's start with reviewing the plan, before we go to the talk.
14:08:23 <kaz> topic: Basic Plan for 2026
14:08:28 <kaz> -> https://github.com/w3c/smart-cities/blob/main/schedule.md schedule.md
14:08:59 <Bert> Kaz shows the planning page on GitHub.
14:09:57 <Bert> Kaz: My suggestionis to publish just one document with the three topics as sections (survey, best practice, basic use cases)
14:10:13 <Bert> <Bert> Sound good to me.
14:10:29 <Bert> kaz: The charter expires end of July.
14:11:02 <kaz> subtopic: Deliverables
14:11:53 <Bert> ... We need to discuss who will be editors for the document this month.
14:12:10 <Bert> ... And try to publish an initiual draft in April
14:12:32 <Bert> ... And update in May. Publish as IG Note.
14:13:00 <Bert> juanjo: @@
14:13:18 <Bert> kaz: We can include link. So answer is yes.
14:13:53 <kaz> subtopic: IG Charter
14:14:42 <Bert> .... About charter: We can extend a charter for a few months. I suggest we start in June to discuss a new charter.
14:15:03 <Bert> ... Then AC review in August and new group starts in September.
14:15:49 <Bert> ... So lat's start with this plan and we modify it as we go along.
14:15:56 <Bert> s/lat's/let's/
14:16:19 <Bert> ... So let's talk now about FireWire
14:16:36 <kaz> topic: Collaboration with ETSI on NGSI-LD
14:16:56 <Bert> Juanjo Hierro sharing screen.
14:17:10 <kaz> s/@@/will our contributions be included in the document?/
14:17:16 <kaz> rrsagent, make log public
14:17:20 <kaz> rrsagent, draft minutes
14:17:21 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:17:28 <Bert> juanjo: Martin Bauer could no be here today.
14:17:38 <Bert> ... I'll reference work we do in ETSI.
14:18:27 <Bert> ... Fiware is a an Open Source initiative for smart solutions in different sectors, like facturies.
14:18:43 <Bert> s/FireWire/Fiware/g
14:18:57 <kaz> s/Fiware/FIWARE/g
14:19:05 <Bert> ... It allows to create platforms.
14:19:29 <Bert> Our members are active in different standards bodies, including W3C and ETSI.
14:20:02 <Bert> ...An important part of our work is how to make different standards work together.
14:20:12 <kaz> rrsagent, draft minutes
14:20:13 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:20:49 <kaz> i/Martin Bau/[slide 1]/
14:20:55 <kaz> [slide 2]
14:20:59 <Bert> ... This is based very much on Digital Twins, or also a model of the real worls.
14:21:16 <Bert> s/worls/world/
14:21:16 <kaz> s/Our members/... Our members/
14:21:20 <kaz> rrsagent, draft minutes
14:21:21 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:21:38 <Bert> ... Model constantly updated based on various sources.
14:21:40 <kaz> chair: Kaz, Koster
14:22:06 <Bert> ... Digital Twins means not necessarily 3D representations.
14:22:33 <Bert> ... It is data management, involved in execution of actions.
14:22:58 <Bert> ... A approach based on a System of Systems.
14:23:13 <kaz> s/A app/An app/
14:23:34 <Bert> ... Can be used in an organization, such a  city, a port...
14:24:12 <Bert> ... Work on standardize interchange of information, e.g., between a city and its port, or between the city and a logistics operator.
14:24:52 <kaz> [slide 3]
14:25:02 <Bert> ... Digital Twins and System of Systems approaches used for integration at multiple levels.
14:25:13 <kaz> [slide 4]
14:25:38 <Bert> ... A Digital Twin is a kind of replica of an asset.
14:26:51 <Bert> ... E.g., is sombody wants to make a claim about something, a street, e.g., then the claim will also be modeled as a digitial twin.
14:27:23 <Bert> ... We are going to add Actions to our model as well.
14:28:06 <Bert> ... Typically a Digital Twin also has location data.
14:28:19 <kaz> s|Collaboration with ETSI|Collaboration with ETSI/FIWARE|
14:28:24 <kaz> rrsagent, draft minutes
14:28:25 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:28:39 <Bert> ... A Context is the state of all digital twins in the collection.
14:28:54 <Bert> ... A standard API is a first needed step.
14:29:29 <Bert> ... But the systems also need to be able to talk about the same concepts, with the same semantics, e.g., temperature.
14:29:56 <Bert> ... So need command data models for digital twins.
14:30:19 <Bert> ... NGSI-LD API developed in ETSI.
14:30:52 <Bert> ... NGSI-LD is a simple (but powerful) REST API.
14:31:23 <kaz> i|NGSI-LD API|[slide 5]|
14:31:25 <Bert> ... Entity types and attributes mapped to paths.
14:31:27 <kaz> rrsagent, draft minutes
14:31:28 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:31:47 <Bert> ... HTTP verbs GET, PUT, PATCH, etc.
14:32:19 <Bert> ... API developed based on developers' experience.
14:32:55 <Bert> ... Includes e.g., geo-queries, e.g., all all entities in an area.
14:33:22 <Bert> ... Also notifications to subscribe to.
14:34:05 <Bert> ... Queries but also push of information.
14:35:01 <Bert> ... To support different visualizations, cen askfor results in the form of GeoJSON.
14:35:19 <Bert> ... But can also be in other formats, such as key-value pairs.
14:35:47 <Bert> ... Supports batch operations (operations on multiple objects at a time).
14:36:10 <Bert> ... Support temporal operations, such as getting time series.
14:36:36 <kaz> [slide 6]
14:36:39 <Bert> ... A Context Broker is an implementation.
14:36:49 <kaz> s/[slide 6]//
14:36:50 <kaz> [slide 6]
14:37:24 <Bert> ... See https://github.com/smart-data-models
14:37:28 <kaz> [slide 7]
14:37:53 <Bert> .Shows diagram of reference architecture.
14:38:03 <kaz> s/.Shows/... Shows/
14:38:16 <Bert> ... Showing it for Smart Cities.
14:39:16 <Bert> juanjo: Examples: air quality, traffic level, sensors and devices to update attributes of the system.
14:39:36 <Bert> ... A Context Broker is a means to intregrate the information.
14:39:48 <Bert> ... Some information relevant for some processes.
14:40:00 <kaz> i|How long will|topic: Quick question to Juanjo|
14:40:18 <Bert> ... Decoupling the supplier of information form the consumer of that information.
14:40:32 <kaz> s/40/30/
14:40:46 <kaz> i|Logistics (G|juanjo: a bit longer|
14:40:53 <Bert> ... Consumer of data interacts with Context Broker, but need not care about how the info got there.
14:41:05 <kaz> i|Logistics (G|kaz: ok. let's use 40 mins then.|
14:41:11 <kaz> rrsagent, draft minutes
14:41:12 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:42:19 <Bert> ... Updates of data are a constant stream. Can now integrate AI to get insights from the incoming data.
14:42:24 <kaz> i|a bit longer|scribenick: kaz|
14:42:33 <kaz> i|First some|scribenick: Bert|
14:42:35 <kaz> rrsagent, draft minutes
14:42:37 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:42:43 <Bert> ... E.g., I may have a system to predict traffic.
14:43:09 <Bert> ... Can then add an attribute to the system with the predicted traffic.
14:43:26 <Bert> ... There may also be a 3D representation.
14:44:04 <Bert> ... Extension to data spaces: market for data.
14:44:08 <kaz> [slide 8]
14:44:38 <Bert> ... FIWARE used by more than 300 cities already.
14:45:08 <Bert> ...Not just in Europe, but also in Japan, India, Korea, etc.
14:45:11 <kaz> [slide 9]
14:45:33 <Bert> ... About relation with WoT:
14:45:53 <Bert> ... a Thing can map to an Entity in NGSI-LD.
14:46:04 <kaz> s/WoT:/WoT/
14:46:15 <kaz> [slide 10]
14:47:01 <Bert> ... WoT model was interesting to us. Thing Description is an opportunity for us.
14:47:13 <kaz> s/WoT model/WoT Thing Model/
14:47:28 <Bert> ... And we want to push NGSI-LD as a Thing Description.
14:47:48 <kaz> s/Thing Description/Deriving Thing Description from Thing Model/
14:47:51 <Bert> ... It can provide a default REST API.
14:48:00 <kaz> [slide 11]
14:48:45 <Bert> ... NGSI-LD can make new things possible in WoT, such as queries over multiple things.
14:48:53 <kaz> [slide 12]
14:49:05 <kaz> q?
14:49:56 <kaz> [slide 13]
14:50:03 <Bert> ... We now have a first proposal for Actions and that can lead to a one-to-one mapping with WoT.
14:50:37 <kaz> i|slide 13|... (gives summary)|
14:50:44 <kaz> rrsagent, draft minutes
14:50:46 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
14:51:08 <Bert> ... Next steps are @@
14:51:54 <kaz> scribenick: mjk
14:52:39 <mjk> kaz: Agree with this proposal
14:53:14 <mjk> ... we can bring a proposal to the WoT working group
14:53:50 <mjk> ... we need to define how the integration of TD and Smart Models works
14:54:16 <mjk> ... how to handle semantic information including geolocation data
14:57:32 <mjk> Juanjo: we can describe device APIs better using Thing Description and Thing Models in a JSON-LD format
14:58:23 <mjk> ... Another aspect is that NGSI-LD doesn't constrain the security framework
14:58:38 <mjk> ... We can integrate with VC
14:59:16 <mjk> ... and position several W3C standards in the Smart City arena
14:59:30 <kaz> mjk: thank you!
14:59:37 <kaz> ... also fully agree with you
14:59:47 <kaz> ... basically you have graph API for smart cities
15:00:08 <kaz> ... applying WoT to that model would make it even smoother
15:00:22 <kaz> ... device api described by Thing Description
15:00:32 <kaz> ... to me, all that would make sense
15:00:37 <kaz> ... and likd the direction
15:01:33 <kaz> ... need to figure out how to bring the ideas
15:01:40 <mjk> kaz: let's come to the WG with concrete ideas
15:02:11 <mjk> kaz: would like to arrange another meeting to focus on stakeholders
15:02:29 <mjk> ... AOB?
15:02:29 <mjk> ... adjourn
15:02:45 <kaz> rrsagent, draft minutes
15:02:46 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
15:03:40 <kaz> i|thank you!|scribenick: kaz|
15:04:28 <kaz> i|thank you|kaz: I agree with you about using the other W3C standards also like VC and DID :)|
15:04:32 <kaz> rrsagent, draft minutes
15:04:33 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
15:04:46 <kaz> i|let's come to the|scribenick: mjk|
15:04:47 <kaz> rrsagent, draft minutes
15:04:49 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
15:05:08 <kaz> s/... adjourne/[adjourned]/
15:05:10 <kaz> rrsagent, draft minutes
15:05:11 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
15:05:35 <kaz> d|s/... adjourne/[adjourned]/||
15:05:54 <kaz> rrsagent, draft minutes
15:05:56 <RRSAgent> I have made the request to generate https://www.w3.org/2026/03/02-smart-cities-minutes.html kaz
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