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Session Topic Discussion
Duration 1 hour
Date/Time September 23 2020 16:00 GMT
9:00am PDT/12:00pm EDT
5:00pm BST/6:00pm CEST
Convener Ken Baclawski

Ontology Summit 2020 Topic:Communiqué Discussion


  • Return to discussion of the Communiqué for the Ontology Summit 2020: Knowledge Graphs

Conference Call Information

  • Date: Wednesday, 23-September-2020
  • Start Time: 9:00am PDT / 12:00pm EDT / 6:00pm CEST / 5:00pm BST / 1600 UTC
  • Expected Call Duration: 1 hour
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[12:04] David Eddy: KGs are HOT!

[12:05] David Eddy: who cares what KGs are... they're HOT... vendors are piling in. </sarc>

[12:06] Cas Miles: (Hello David, I am Cas! I am just a student with a bit of interest of ontology, and AI and NLP.)

[12:08] David Eddy: @Cas... hello.. .welcome

[12:09] Gary Berg-Cross:: "Knowledge Graph (KG): A combination of technologies, specifications, and data cultures for densely interconnecting (Web-scale) data across domains in a human and machine readable and reasonable way. The term knowledge graph itself does not prescribe any particular technology stack. More formally, a knowledge graph (as a set of statements) can be thought of as a node and edge labeled directed multigraph. The largest publicly available knowledge graph is the so-called Linked Data cloud based on the RDF/Semantic Web technology stack."

[12:09] AlexShkotin: KG is mostly a KB of our days. And ontology is a schema part of that KG.

[12:10] Gary Berg-Cross:: It is also true that knowledge graph in the way it is being used is as a data graph. That said, and the way we have been using it in Siemens CT, is that the data are instances of ontologies, and the labeled arcs are the properties representing the class dependencies in an ontology.

As a result, our definition of a knowledge graph would be an instance graph associated with a collection of ontologies. That is, the data are all compliant with the associated ontologies. As such it is much more than just a labeled graph. Respectfully submitted, Jack Hodges

[12:11] AlexShkotin: It would be great to think that Wikipedia is KG too

[12:18] Douglas Miles: Some work on Knowledge Graphs I am doing:

[12:21] Gary Berg-Cross:: Ken is this still the working outline?


Whence - what brought the use of graphs in as persistence mechanisms (will need to address other non-relational persistence mechanism); historical background; this can include parts of 'why'

Current State - How are graph persistence mechanisms being used

Problems - what are the differences in the current uses and what problems they may cause going forward

Whither - Our recommendation of how a the notion 'knowledge graph' should be defined; How standards can help (and maybe a lead in to the next year's summit topic).

[12:23] Gary Berg-Cross:: Remember I drafted, with some help a doc on "Problems with Knowledge Graphs"

[12:26] AlexShkotin: Whither

[12:31] Gary Berg-Cross:: OK, so we have an outline to the communique and need to flesh out the Introduction.

[12:36] DrRaviSharma: It has been agreed that Ravi will work with Ken who has already collected all threads from emails and combined with session pages dealing with What are KGs and presentation and recording materials to extract and create Communique section dealing with What are KGs

[12:38] John Sowa: Much simpler definition of KG: A KG is a subset of Common Logic that uses a graph notation to express an ontology or information expressed with the concepts defined by the ontology.

[12:41] David Eddy: and what is "common logic"?

[12:43] DrRaviSharma: thanks John

[12:44] DrRaviSharma: John - I have captured many items including some from your slides that we will include in summary section on What is KG.

[12:44] John Sowa: David, Common Logic is the superset of OWL and any other logic used to state ontologies.

[12:45] John Sowa: For details, see

[12:46] John Sowa: Common Logic is ISO/IEC standard 24007.

[12:46] John Sowa: See the discussion of DOL in eswc.pdf

[12:46] DrRaviSharma: Ram suggested that we think of end date for Communique say Oct 30, then work backwards and target framework topics inputs from respective POCs to allow about 2 weeks to Ken to put it together.

[12:47] David Eddy: @John... thank you. I do recognize the various associations, but have no idea what the practical value/applications are. That said... I've been in MVS & z/OS for 50 years & haven't touched any higher level of math in 54 years.

[12:48] John Sowa: David, the practical implications are stated in eswc.pdf.

[12:48] David Eddy: @JFS... thx for focus on eswc.pdf

[12:49] John Sowa: Short version: Every version of KGs used so far is limited to a tiny subset of Common Logic.

[12:49] John Sowa: Most of those KGs use only the RDF subset of CL for instances

[12:50] John Sowa: Others use the RDFS subset for small ontologies.

[12:50] TerryLongstreth: Common logic is ISO 24707

[12:50] Douglas Miles: DOLCE>

[12:51] DrRaviSharma: ISO 24707 corrected by john

[12:51] David Eddy: @JFS... I do have ewsc.pdf already. Unfortunately unread.

[12:51] AlexShkotin: DOL

[12:51] Douglas Miles: thx

[12:51] DrRaviSharma:

[12:52] AlexShkotin:

[12:53] David Eddy: @all... is there anything to help map the opaque language used inside software application to various "standards?"

[12:53] Douglas Miles: thank you all.. I have to sign off Zoom.. will leave this open

[12:53] David Eddy: OUT

[12:55] Douglas Miles: I'd be happy to read all i can of course

[12:55] DrRaviSharma: Ken thanks for pulling all threads together

[13:00] Cas Miles: Thank you Ken, and everyone! I'll be doing some reading as well.


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