IRC log of wot-di on 2015-07-01
Timestamps are in UTC.
- 15:06:59 [RRSAgent]
- RRSAgent has joined #wot-di
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- logging to http://www.w3.org/2015/07/01-wot-di-irc
- 15:07:08 [dsr]
- rrsagent, set logs public
- 15:07:36 [helena]
- helena has joined #wot-di
- 15:09:38 [DanhLePhuoc]
- present+ DanhLePhuoc
- 15:10:27 [DanhLePhuoc]
- https://filesender.heanet.ie/1.6/?vid=0b60067c-e7bd-c629-bacf-00005974b1bb, the link to the presentation
- 15:10:40 [dsr]
- scribenick: dsr
- 15:10:50 [dsr]
- meeting: Wot Discovery Task Force
- 15:11:22 [dsr]
- Dahn presents Thing Discover on the Graph of Things see link above
- 15:11:33 [dsr]
- s/Dahn/Danh/
- 15:12:19 [dsr]
- Danh: I try to share my demo
- 15:12:51 [dsr]
- Screen shows world map with heat map and locations as overlay
- 15:13:00 [dsr]
- chair: Dave
- 15:13:33 [dsr]
- Present+ Dave, Danh, Ashok Helena, Joerg
- 15:13:41 [dsr]
- Regrets: Soumya
- 15:14:28 [dsr]
- Danh shows how you can browse the data screens using some JavaScript effects
- 15:14:59 [dsr]
- At the bottom there is a live display of data courtesy of a web socket connection with the server.
- 15:16:02 [dsr]
- He returns to the slide presentation
- 15:16:52 [dsr]
- We use HTTP content negotiation as a discovery mechanism, along with a sparql query.
- 15:17:38 [dsr]
- The query results are returned in JSON
- 15:18:17 [dsr]
- We’re using an RDF graph for the data models
- 15:19:21 [dsr]
- There are plenty of ontologies available.
- 15:19:33 [dsr]
- We also have RDF linked data streams
- 15:19:55 [dsr]
- Static knowledge is treated as background knowledge
- 15:20:53 [dsr]
- The sensor metadata describes the stream, with sparql 1.1 specification
- 15:21:47 [dsr]
- We had to extend the sparql query language slightly to be able to aggregate data over a given time period
- 15:23:08 [dsr]
- This also allows you to query the data at a specific time (in the past)
- 15:23:53 [dsr]
- You can define a query that returns a stream for data that satisfies that query
- 15:26:28 [dsr]
- Slide with stats on amount of data, cluster of servers and the software libraries
- 15:27:11 [dsr]
- People ask if you can make it smaller? Yes through smart gateway
- 15:28:12 [dsr]
- We’re working on making it work on Android and Raspberry Pi
- 15:28:30 [dsr]
- The code foot print is in range 4-8 MB.
- 15:28:45 [dsr]
- Memory foot print in range 4 - 64MB
- 15:29:15 [dsr]
- Plenty of room for further improvementsto make it smaller faster and more scalable
- 15:29:55 [dsr]
- Danh finishes
- 15:30:09 [dsr]
- Dave: questions anybody?
- 15:31:01 [dsr]
- Joerg: this looks like a complete solution inspired from sensor networks. We now need to identify some potential building blocks in respect to discovery, any suggestions?
- 15:31:30 [dsr]
- Danh: we only use REST API, complexity is determined by the nature of the query
- 15:32:09 [dsr]
- A few years ago we implemented a small query engine for simple queries
- 15:32:31 [dsr]
- Joerg: in the task force we discussed different notions of discovery
- 15:33:19 [dsr]
- Your presentation is about discovery of certain resource with a particular characteristic.
- 15:33:30 [dsr]
- Dahn: yes, here we focus on data discovery
- 15:33:45 [dsr]
- First you need to discovery the sparql endpoint
- 15:34:32 [dsr]
- The linked data community has ideas for how to query endpoints for their metadata, e.g. their capabilities
- 15:35:43 [dsr]
- We’ve looked at using JSON for queries as an alternative to sparql for restricted classes of queries
- 15:35:55 [dsr]
- Dave: any other questions?
- 15:36:35 [dsr]
- Helena: I want to understand continuuous discovery, is there an anouncement for sensors?
- 15:37:16 [dsr]
- Danh: you first need to discover the query end point, and can then query for all sensors satisfying some constrain.
- 15:37:31 [dsr]
- Helena: the sensors have to register with the system in some way?
- 15:37:36 [dsr]
- Danh: yes
- 15:39:03 [dsr]
- Dave: this is like the Compose project where queries for event streams from a set of sensors is a live query, i.e. reflects the sensors currently registered
- 15:39:47 [dsr]
- Danh: one point - this approach doesn’t have to run on the public Internet.
- 15:40:50 [dsr]
- Topic: Technology Landscape for Discovery
- 15:44:18 [dsr]
- Joerg: what are the steps in discovery with links to use cases, and then look at dependencies on work in othe task forces.
- 15:45:34 [dsr]
- You have already listed some mechanisms for discovery, and should now add examples, and the relationship to thing descriptions, APIs and to security, privacy etc.
- 15:46:23 [dsr]
- Dave asks for contributions for next week’s call
- 15:46:45 [dsr]
- Joerg: yes we should invite contributions for the landscape analysis along with links
- 15:47:42 [dsr]
- Dave: I could offer to provide an overview of the Compose system approach to discovery.
- 15:48:14 [dsr]
- Joerg: yes, but you should break it down into the components/building blocks
- 15:49:51 [dsr]
- present+ Hamid
- 15:50:13 [dsr]
- rrsagent, make minutes
- 15:50:13 [RRSAgent]
- I have made the request to generate http://www.w3.org/2015/07/01-wot-di-minutes.html dsr