On Dec 1, 2019, at 7:55 PM, Michael F Uschold <[email protected]
<mailto:[email protected]>> wrote:
Thanks Holger, this is helpful. A few things to follow up on:
> I installed 6.0.1 and can reproduce that it cannot directly
import from the web.
Even if the file is in on a local hard drive, the import does not
work w/o a base statement. Did you reproduce that also?
> I can also do Web imports for other URLs with 6.0.1 with no
problem
So can I, but so far, I cannot do so unless there is a base
statement.
Some versions of TBC seem to work w/o a base statement, but the
current free version (6.0.1 ) does not. So the emphasis on the
base statement does not always seem to matter. Are there any
plans to release an update to the free edition beyond 6.0.1?
Actually, somehow, my colleague does have a later version
(6.1.1), but it is no longer available from your downloads page.
At any rate, thank you for the workaround.
Michael
On Wed, Nov 20, 2019 at 6:38 PM Michael F Uschold
<[email protected] <mailto:[email protected]>> wrote:
---------- Forwarded message ---------
From: *Holger Knublauch* <[email protected]
<mailto:[email protected]>>
Date: Tue, Nov 19, 2019 at 00:23
Subject: Re: [topbraid-users] Cannot get TBC import to work
properly.
To: <[email protected]
<mailto:[email protected]>>
Hi Mike,
On 19/11/2019 12:21, UscholdM wrote:
I was having problems with ontology import. So I did some
experiments. In Protégé, I created a simple ontology that
does nothing other than import another ontology, which is
available on the web. I saved it, and when I opened it in
Protégé, it behaved as expected. When I try to do so in TBC
Free Edition 6.0.1 it does not work.
I did further experimenting by downloading the imported
ontology directly from the web and put the file in the TBCFE
workspace. That also did not work. I then read the several
paragraphs of TBC documention on working with imported
ontologies. It seems like the base uri of an ontology plays
a prominent role. That seemed odd, since the ontology URI
or ontology Version URI is what matters. Nevertheless, I
tried manually inserting a base statement into the ontology
to be imported setting it to the ontology URI and that also
did not work. When I set the base URI to the Version IRI
that was being explicitly imported, it worked.
The downloads page indicates that 6.0.1 is the latest stable
free version. I asked my colleague to try it on his version,
and it worked. I saw that he has the free edition, but his
version was 6.1.1. How can that be? I asked other colleagues
to try the same experiment and the importing was not working
on their then-current version of TBCME, but when they
installed the latest version it did work.
1. Attached is a very explicit set of things that I did,
and that I sent to colleagues to report back on. It also
includes screenshots of errors.
2. The tiny ontology that imports another ontology.
Punch line:
* Is there a free version of TBC that I can currently
download that will import ontologies on the web that do not
have a base statement?
Not that I know of.
* Is there any reason to give prominence to the base
statement? It seems that what really matters is the IRI or
VersionIRI of the imported ontology.
The reason why we don't use the owl:versionIRI is that this
would require loading the graph first, just to detect the
URI. With large files this is not feasible. Also, the web
import needs to start somewhere. From the owl:imports
statement we only have the physical URL, so we try to resolve
the graph from there. If the versionIRI was different from
the physical URI, how could a web import possibly work?
(In your example the versionIRI is identical to the physical
location so I don't understand why this topic is relevant).
* Is there something else that could be causing the problem
that adding a base statement solves by accident?
I installed 6.0.1 and can reproduce that it cannot directly
import from the web. Maybe that particular version had a bug,
or the server response (HTTP headers/mime type?) from this
particular location is a problem for this version. It works
fine in later versions, and I can also do Web imports for
other URLs with 6.0.1 with no problem.
In any case, here is a work-around:
1) Right-click on some project and select Import RDF file
from the Web
<inbekjabdagdjhep.png>
2) Fill in as shown
<dclenjkiecnajbee.png>
This produces a local file starting with
# baseURI: https://ontologies.semanticarts.com/o/gistTop9.0.0
which is our usual convention to recognize graph URIs. This
line is saved at the beginning of each TTL file so that the
system doesn't need to first scan the whole file for its
owl:Ontology or owl:versionInfo or whatever. It improves
start-up time and is the only scalable solution for very
large files.
We generally recommend using local files over web imports as
the latter may be unstable (server down, changing data etc).
HTH
Holger
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Michael Uschold
Senior Ontology Consultant, Semantic Arts
http://www.semanticarts.com <http://www.semanticarts.com/>
LinkedIn: www.linkedin.com/in/michaeluschold
<http://www.linkedin.com/in/michaeluschold>
Skype, Twitter: UscholdM
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