Re: [Semediawiki-user] How does Ontology import feature work in Semantic Wiki 0.4?

[Markus <ma...@ai...>]

On Saturday 24 June 2006 01:30, Jones, David H wrote:
> I've configured Semantic Wiki 0.4 to include the Ontology import
> feature, but don't see any documentation on how it works, or even any
> evidence that it is installed correctly (such as a Special: page).  Can
> anyone explain how/if this works in 0.4.

It works in 0.4 (at least we have used it there already). You can only acce=
ss=20
it if you are an administrator of your wiki (more precisely: if you can=20
delete articles). Go to Special:Specialpages and scroll down to "Import=20
ontology" which brings you to Special:OntologyImport.

There, you can upload some owl/rdf ontology to get a list of importable=20
statements which you can select/deselect manually. Loading the ontology wil=
l=20
only work if you installed RAP as described in INSTALL. It is wise to try i=
t=20
with a small part of the ontology first, since it can be very cumbersome to=
=20
manually delete thousands of imported pages.

Known limitations/problems are:

* Datetype properties: if you want to import data values given to some=20
properties, you need to create a suitable property in the wiki first.=20
Otherwise, the (wiki)type of the attribute might not be known during import=
,=20
and the imported values will not be saved until the next time that the=20
articles are edited.
* It was reported that sometimes some statements do not show up (for import=
=20
selection). We still have to investigate why ...
* Character encoding: on some servers, the character encoding settings are=
=20
broken in such a way that uploaded files are interpreted in the wrong=20
encoding. This is not our bug, but it can be very annoying if you have an=20
ontology with non-ASCII symbols. Always do some testing first.
* Output text: the generated text for imported articles is rather crude. If=
=20
you have a substantial importing task, it might be useful to modify the=20
soruce code to yield another text (or to insert further data in the generat=
ed=20
articles).

Regards,

Markus

=2D-=20
Markus Kr=F6tzsch
Institute AIFB, University of Karlsruhe, D-76128 Karlsruhe
ma...@ai...        phone +49 (0)721 608 7362
www.aifb.uni-karlsruhe.de/WBS/     fax +49 (0)721 693  717