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ontop4obda
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ontop4obda
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Welcome
Welcome to the group of the
Ontop
Virtual Knowledge Graph system.
To get more information about Ontop, visit the official website at:
https://ontop-vkg.org
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Rashif Rahman
,
Benjamin Cogrel
8
Aug 4
Aggregate query with subquery failing on ONTOP endpoint
Awesome, thanks a lot for all your support! This really helped us get the progress we needed. We'
unread,
Aggregate query with subquery failing on ONTOP endpoint
Awesome, thanks a lot for all your support! This really helped us get the progress we needed. We'
Aug 4
David Großmann
,
davide lanti
5
Jul 6
Ontop ist adding useless unions when adding another column in my SPARQL
Hi David, the reason why Ontop produces so many unions is because :meddok_CODE_GES is defined in *
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Ontop ist adding useless unions when adding another column in my SPARQL
Hi David, the reason why Ontop produces so many unions is because :meddok_CODE_GES is defined in *
Jul 6
Marco Antonio Stranisci
,
Benjamin Cogrel
2
Jun 22
memory issue with large DB
Hi Marco, Which database system are you using? And which version of Ontop? I suspect that the
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memory issue with large DB
Hi Marco, Which database system are you using? And which version of Ontop? I suspect that the
Jun 22
Guohui Xiao
Jun 20
Re: How to mapping correctly?
Hi, I noticed that there are several messages from you to the group but classified as spam. I only
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Re: How to mapping correctly?
Hi, I noticed that there are several messages from you to the group but classified as spam. I only
Jun 20
Roman Shvetsov
,
Guohui Xiao
2
Jun 10
Get sparql query results as ontology
Hi Roman, I am not sure if the following very relevant issue is created by you. https://github.com/
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Get sparql query results as ontology
Hi Roman, I am not sure if the following very relevant issue is created by you. https://github.com/
Jun 10
Dalmir da Silva
,
Guohui Xiao
3
May 25
Multiple reasoning schemas
Thanks Guohui Xiao, All the best! On Tuesday, May 24, 2022 at 8:22:52 AM UTC-3 Guohui Xiao wrote: Hi,
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Multiple reasoning schemas
Thanks Guohui Xiao, All the best! On Tuesday, May 24, 2022 at 8:22:52 AM UTC-3 Guohui Xiao wrote: Hi,
May 25
Duncan Nimmo
,
Benjamin Cogrel
2
Apr 28
Question re. configuration of dialect for DB2 driver using ontop-cli-4.2.1
Hi Ducan, Thank you for reporting the issue. Which version of DB2 are you using? On DB2 v11.5.4.0, I
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Question re. configuration of dialect for DB2 driver using ontop-cli-4.2.1
Hi Ducan, Thank you for reporting the issue. Which version of DB2 are you using? On DB2 v11.5.4.0, I
Apr 28
Johan Van Noten
, …
Benjamin Cogrel
7
Jan 21
OBDA mapping with SPARQL source
Hi, Thank you Johan for this detailed explanation, the problem is now clear. It is a perfectly
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OBDA mapping with SPARQL source
Hi, Thank you Johan for this detailed explanation, the problem is now clear. It is a perfectly
Jan 21
Guohui Xiao
Jan 7
[ANN] Release of Ontop 4.2.0
Dear Ontop users, We are happy to announce the stable release of Ontop 4.2.0! This new version
unread,
[ANN] Release of Ontop 4.2.0
Dear Ontop users, We are happy to announce the stable release of Ontop 4.2.0! This new version
Jan 7
Roman Shvetsov
12/16/21
Existential Reasoning + Symmetric and transitive object properties.
Hi! A couple of questions 1) I tried to go through tutorial and until the bonus part everything went
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Existential Reasoning + Symmetric and transitive object properties.
Hi! A couple of questions 1) I tried to go through tutorial and until the bonus part everything went
12/16/21
yize
12/14/21
How to solve CLOB column in Oracle?
Hi ontop4obda group, I'm using ontop to extract data from Oracle. Here are commands I use: ontop
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How to solve CLOB column in Oracle?
Hi ontop4obda group, I'm using ontop to extract data from Oracle. Here are commands I use: ontop
12/14/21
Bindu K
,
Benjamin Cogrel
2
12/5/21
Mappings for specific tables only
Hi Bindu, Sorry for the late reply. No, Ontop does not offer this option at the moment, but it makes
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Mappings for specific tables only
Hi Bindu, Sorry for the late reply. No, Ontop does not offer this option at the moment, but it makes
12/5/21
Tulio Vidal
12/3/21
Problem: SPARQL - Slow Queries when sharing properties with a same name/URI
Hello, I'm having a problem where I've tried countless possibilities and I would like help. I
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Problem: SPARQL - Slow Queries when sharing properties with a same name/URI
Hello, I'm having a problem where I've tried countless possibilities and I would like help. I
12/3/21
Martin Just
11/5/21
OBDA syntax documentation
Hello everyone, when searching the documentation at https://ontop-vkg.org/ I can't really find
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OBDA syntax documentation
Hello everyone, when searching the documentation at https://ontop-vkg.org/ I can't really find
11/5/21
David Großmann
, …
Benjamin Cogrel
7
11/3/21
Joining two Tables with Ontop
Hi David, Axioms like "C10.0 subClassOf meddok_CODE_GEST only {"C10.0"}" are
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Joining two Tables with Ontop
Hi David, Axioms like "C10.0 subClassOf meddok_CODE_GEST only {"C10.0"}" are
11/3/21
KimSia Sim
10/22/21
Newbie to virtual KG: can ask what resources to read or watch to better use ontop?
Hi there, I stumbled onto ONTOP by accident. I am a web developer who works extensively with RDBMS
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Newbie to virtual KG: can ask what resources to read or watch to better use ontop?
Hi there, I stumbled onto ONTOP by accident. I am a web developer who works extensively with RDBMS
10/22/21
Ekaterina Chuprikova
,
roman.ko...@gmail.com
4
10/14/21
SPARQL query in R
Thank you all for answering my question: @Peter Hopfgartner has suggested a solution that worked for
unread,
SPARQL query in R
Thank you all for answering my question: @Peter Hopfgartner has suggested a solution that worked for
10/14/21
Mark H Phillips
10/7/21
embarrassingly easy driver question
Just starting with onto (latest version) in Protege 5.5.0 I am trying to install a JDBC driver to an
unread,
embarrassingly easy driver question
Just starting with onto (latest version) in Protege 5.5.0 I am trying to install a JDBC driver to an
10/7/21
Martin Just
,
Benjamin Cogrel
2
10/7/21
Using two ontologies and two mappings
Hi Martin, For the ontologies, you can create a third ontology file that imports the two ontologies,
unread,
Using two ontologies and two mappings
Hi Martin, For the ontologies, you can create a third ontology file that imports the two ontologies,
10/7/21
Johan Van Noten
,
Benjamin Cogrel
2
9/29/21
Combining SPARQL queries with updates
Hi Johan, Yes Ontop is read-only. Because of the view-update problem, integrating updates in a
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Combining SPARQL queries with updates
Hi Johan, Yes Ontop is read-only. Because of the view-update problem, integrating updates in a
9/29/21
Johan Van Noten
, …
Benjamin Cogrel
17
9/28/21
Trying Chimera's OntopSpark
After some discussions with Benjamin, we've updated to the master version pre-4.2.0. We can't
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Trying Chimera's OntopSpark
After some discussions with Benjamin, we've updated to the master version pre-4.2.0. We can't
9/28/21
Phil Ashworth
,
Benjamin Cogrel
2
8/12/21
Connecting to Google BigQuery
Hi Phil, I personally have never used Ontop with Google BigQuery. Since Ontop is having no dialect
unread,
Connecting to Google BigQuery
Hi Phil, I personally have never used Ontop with Google BigQuery. Since Ontop is having no dialect
8/12/21
Martin Just
,
Benjamin Cogrel
5
7/28/21
Query SubClasses
Hello Martin, Thanks for asking. Unfortunately we don't have yet progress to report on it but it
unread,
Query SubClasses
Hello Martin, Thanks for asking. Unfortunately we don't have yet progress to report on it but it
7/28/21
Matthew Nguyen
,
Benjamin Cogrel
2
7/28/21
chaining federated (service) calls
Hi Matthew, I am happy to hear that you had a positive experience at work with Ontop. I am sorry for
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chaining federated (service) calls
Hi Matthew, I am happy to hear that you had a positive experience at work with Ontop. I am sorry for
7/28/21
Gary Kopp
6/22/21
[Newbie] PostGIS Setup
I will be starting a fresh SPARQL endpoint using the downloaded CLI. It will not yet have an ontology
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[Newbie] PostGIS Setup
I will be starting a fresh SPARQL endpoint using the downloaded CLI. It will not yet have an ontology
6/22/21
David Großmann
,
roman.ko...@gmail.com
4
6/14/21
Relation IDs mismatch - Mapping OWL to Oracle DB with Ontop
Hello Roman, your are absolutely right, when I retyped my target I missed the colon and did not
unread,
Relation IDs mismatch - Mapping OWL to Oracle DB with Ontop
Hello Roman, your are absolutely right, when I retyped my target I missed the colon and did not
6/14/21
reza sedighi
,
Jerven Bolleman
2
6/6/21
with RDF triplestore
Hi Reza, Yes this is a very common way of using ontop. Regards, Jerven On Saturday, 5 June 2021 at 09
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with RDF triplestore
Hi Reza, Yes this is a very common way of using ontop. Regards, Jerven On Saturday, 5 June 2021 at 09
6/6/21
Huy Tran
,
Guohui Xiao
2
5/22/21
Supporting a new DMBS (GeoSpark)
Hi Ba Huy, Your messages have been classified by Google as spam. That's why we did not see them
unread,
Supporting a new DMBS (GeoSpark)
Hi Ba Huy, Your messages have been classified by Google as spam. That's why we did not see them
5/22/21
Guohui Xiao
3/3/21
[ANN] Release of Ontop 4.1.0
Dear Ontop users, We are happy to announce the stable release of Ontop 4.1.0! This new version
unread,
[ANN] Release of Ontop 4.1.0
Dear Ontop users, We are happy to announce the stable release of Ontop 4.1.0! This new version
3/3/21
Muffex
, …
Roman Kontchakov
8
1/18/21
Dremio Support
Hi Roman, thanks for your answer. Your changes did resolve all our issues. Thank you so much! :) The
unread,
Dremio Support
Hi Roman, thanks for your answer. Your changes did resolve all our issues. Thank you so much! :) The
1/18/21