tinytim-discuss

[tinyTiM-discuss] Fwd: importing/exporting RDF

[Lars H. <he...@se...>]

Moved to the correct mailing list.



This is a forwarded message

From: Lukas Gießmann <in...@Fh...>
To: tin...@li... <tin...@li...>
Date: Sunday, August 23, 2009 1:27:03 PM
Subject: [tinyTiM-commits] importing/exporting RDF

===8<==============Original message text===============

Hi,

I am implementing an RDF importer and exporter for the TM engine 
Isidorus. I also want to get a brief introduction into the RDf-mapping 
in tinyTiM, to be able to exchange mapped data between tinyTiT and 
Isidorus (when the mapping concepts are not absolutely different). So I 
started to import data with tinyTiM - but importing RDF/XML reqieres a 
mapping-schema. Are any example schemata existing?
Is it possible to import "normal" RDF/XML files without predifend schemata?
What's about exporting Topic Maps as RDF/XML - I didn't find a 
Class/Interface which is able to export TM as RDF/XML?


Thanks & Regards

Lukas

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Re: [tinyTiM-discuss] Fwd: importing/exporting RDF

[Lars H. <he...@se...>]

Hi Lukas,

[...]
> mapping-schema. Are any example schemata existing?

I found a blog entry from Lars Marius which maps SKOS to Topic Maps:
<http://www.garshol.priv.no/blog/10.html>


Best regards,
Lars
-- 
Semagia 
<http://www.semagia.com>

Re: [tinyTiM-discuss] Fwd: importing/exporting RDF

[Lukas G. <in...@Fh...>]

Hi Lars,

thanks for your answer.
I already found some information published by Garshol, but not this one: 
<http://www.garshol.priv.no/blog/10.html>.


Regards Lukas



Lars Heuer schrieb:
> Hi Lukas,
>
> [...]
>   
>> mapping-schema. Are any example schemata existing?
>>     
>
> I found a blog entry from Lars Marius which maps SKOS to Topic Maps:
> <http://www.garshol.priv.no/blog/10.html>
>
>
> Best regards,
> Lars
>   

Re: [tinyTiM-discuss] Fwd: importing/exporting RDF

[Lars H. <he...@se...>]

Hi Lukas,

[...]
> Isidorus (when the mapping concepts are not absolutely different). So I
> started to import data with tinyTiM - but importing RDF/XML reqieres a
> mapping-schema. Are any example schemata existing?

No, the schema is always source-dependent. One could define a standard
mapping which maps the RDF type statement to the tmdm:type-instance
association, but this is not done yet. The RDF readers implement the
RTM mapping described at [1].

> Is it possible to import "normal" RDF/XML files without predifend schemata?

No, since the RDF importers are forced to ignore all statements for
which no mapping is defined, the resulting topic map would always be
empty.

If Isidorus supports CXTM, you can use the CXTM tests provided by the
CXTM test suite [2]. Note, that the last release does not contain the
RDF tests, you have to use the the trunk [3].

All RDF tests are self-contained, which means that the mapping is
defined within the RDF source.


> What's about exporting Topic Maps as RDF/XML - I didn't find a 
> Class/Interface which is able to export TM as RDF/XML?

tinyTiM does not contain any RDF writer yet. I don't have any plans to
write one, since the demand seems to be non-existent. If there are
enough requests, I'll write one. Ontopia provides a RDF/XML writer,
though.


[1] <http://www.ontopia.net/topicmaps/materials/rdf2tm.html>
[2] <http://cxtm-tests.sourceforge.net/>
[3]
<http://cxtm-tests.svn.sourceforge.net/viewvc/cxtm-tests/trunk/rdf/>

Best regards,
Lars
-- 
Semagia 
<http://www.semagia.com>

Re: [tinyTiM-discuss] Fwd: importing/exporting RDF

[Lars H. <he...@se...>]

Hi again,

[...]
> Isidorus. I also want to get a brief introduction into the RDf-mapping
> in tinyTiM, to be able to exchange mapped data between tinyTiT and

Some abstract examples are also shown here:
<http://tinytim.sourceforge.net/docs/2.0/mio/rdf-import.html>.
Although they show only the API and not a concrete mapping.

Best regards,
Lars
-- 
Semagia
<http://www.semagia.com/>

Re: [tinyTiM-discuss] Fwd: importing/exporting RDF

[Lars H. <he...@se...>]

[...]
> Some abstract examples are also shown here:
> <http://tinytim.sourceforge.net/docs/2.0/mio/rdf-import.html>.
> Although they show only the API and not a concrete mapping.

The docs are slightly outdated: The openrdf lib is not required
anymore. You need the ``semagia-mio``, and the ``semagia-mio-rdf``
lib. They are part of the tinytim-mio distribution.


Best regards,
Lars

-- 
Semagia
<http://www.semagia.com/>