Re: [Aperture-devel] Getting info out of RDF

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Thanks, Leo, I will take a look at these resources.  I am doing more  
than just Lucene, so I will most likely want a persistent store that  
I can access  to feed to various libraries, Lucene being one of  
them.  RDF can do that, right?  I guess I was expecting the RDF stuff  
to be more behind the scenes in Aperture.  I know you guys are coming  
from the Semantic Web world, so it makes sense for what you are  
doing, but for someone like me who just needs a single interface to  
the various extraction libraries, I don't really want to worry about  
the underlying implementation and setup.  I think, however, that I  
can handle this by wrapping the appropriate pieces for my application  
and making it transparent to my users.

Cheers,
Grant

On Jul 24, 2007, at 10:43 AM, Leo Sauermann wrote:

> Hi Grant,
>
> hey, before you continue:
> did you look at our experimental Aperture LuceneHandler?
> https://aperture.svn.sourceforge.net/svnroot/aperture/trunk/ 
> aperture-addons/src/java/org/semanticdesktop/aperture/lucenehandler/ 
> LuceneHandler.java
> https://aperture.svn.sourceforge.net/svnroot/aperture/trunk/ 
> aperture-addons/src/java/org/semanticdesktop/aperture/lucenehandler/ 
> LuceneCrawlerExample.java
> (btw: we switched to SVN)
> perhaps its exactly what you need, and if not, perhaps you could  
> improve/extend it?
>
> we use RDF2Go, which is slightly documented here:
> http://wiki.ontoworld.org/wiki/RDF2Go
> http://wiki.ontoworld.org/wiki/Semweb4j/models/step2
>
> best
> Leo
>
>
> It was Grant Ingersoll who said at the right time 23.07.2007 20:15  
> the following words:
>> This doesn't return any results for me.  When I do
>> RDFContainer metadata = ...
>>
>> ...//Add stuff to the model
>>
>> metadata.getModel().writeTo(new PrintWriter(System.out));
>>
>> it prints out the properties, but when I call the method below it
>> doesn't return any results.  So, I believe there are entries in my
>> model, just not sure how to get at them.
>> Is there a good primer somewhere on how all this RDF stuff works?
>> All I really want to be able to do is get out the metadata and the
>> content for indexing in Lucene and use in other applications.
>>
>> Is there anyway to interrogate the Extractor to see what properties
>> it could produce?
>>
>> Thanks so much for all your help,
>> Grant
>>
>>
>> On Jul 23, 2007, at 10:20 AM, Antoni Mylka wrote:
>>
>>
>>> Grant Ingersoll pisze:
>>>
>>>> http://aperture.sourceforge.net/tutorial/rdf.html covers how to put
>>>> things into the RDF container, can someone point me to a  
>>>> tutorial or
>>>> docs on how to get stuff out of the Container?  Where can I get a
>>>> collection of all the URIs that are in the RDFContainer after
>>>> extraction has taken place?
>>>>
>>>>
>>> You could do it like this
>>>
>>>      private static List<URI> getPropertyURIs(RDFContainer
>>> container) {
>>>          List<URI> result = new LinkedList<URI>();
>>>          Model model = container.getModel();
>>>          String uriString = container.getDescribedUri().toSPARQL();
>>>          String query =
>>>              "SELECT DISTINCT ?property WHERE { " +
>>>               uriString + " ?property ?o }";
>>>          QueryResultTable queryResult = null;
>>>          ClosableIterator<QueryRow> iterator = null;
>>>          try {
>>>              queryResult = model.sparqlSelect(query);
>>>              iterator = queryResult.iterator();
>>>              while (iterator.hasNext()) {
>>>                  QueryRow row = iterator.next();
>>>                  URI uri = (URI)row.getValue("property");
>>>                  result.add(uri);
>>>              }
>>>          } catch (Exception e) {
>>>              e.printStackTrace();
>>>          } finally {
>>>              if (iterator != null) {iterator.close();}
>>>          }
>>>          return result;
>>>      }
>>>
>>> Aperture components (in the current trunk) use the Aperture Data
>>> Ontology, augmented by elements of Dublin Core. Some components
>>> also use
>>> VCARD, ICAL and ICALTZD ontologies.(OutlookCrawler crawls calendar
>>> events in ICAL whereas the IcalCrawler crawls elements in ICALTZD
>>> All of
>>> them can be viewed here:
>>>
>>> <https://aperture.svn.sourceforge.net/svnroot/aperture/trunk/
>>> aperture/doc/ontology/>
>>>
>>> Each Aperture Data Object is represented as an instance of a
>>> DataObject
>>> class. Such an instance can have any number of properties from the
>>> above-mentioned vocabularies. At the moment there is no detailed
>>> documentation about what kind of rdf structures does each Aperture
>>> component produce. The important properties that are often  
>>> present are
>>> dc:title, dc:subject and aperture:fullText but you'd need to take a
>>> look
>>> at the ontologies, the source code or analyze the output of some
>>> example
>>> programs to get a more detailed picture.
>>>
>>> I'm currently working on a major overhaul of the ontology
>>> architecture.
>>> In the Nepomuk Social Semantic Desktop project
>>> (http://nepomuk.semanticdesktop.org) a unified ontology framework  
>>> for
>>> dektop resources has been developed. You can take a look at the
>>> current
>>> draft at
>>>
>>> <http://dev.nepomuk.semanticdesktop.org/repos/trunk/ontologies/nie/
>>> htmldocs/nie.html>
>>>
>>> This migration is being done in the NIEIntegrationBranch. When it is
>>> complete (hopefully this week), the RDF structures generated by
>>> Aperture
>>> will be quite well documented in the NIE specification and in the
>>> Javadoc of appropriate components.
>>>
>>> Antoni Mylka
>>> ant...@df...
>>>
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>> ------------------------------------------------------
>> Grant Ingersoll
>> http://www.grantingersoll.com/
>> http://lucene.grantingersoll.com
>> http://www.paperoftheweek.com/
>>
>>
>>
>> --------------------------------------------------------------------- 
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>>
>
>
> -- 
> ____________________________________________________
> DI Leo Sauermann       http://www.dfki.de/~sauermann
>
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> Amtsgericht Kaiserslautern, HRB 2313
> ____________________________________________________

------------------------------------------------------
Grant Ingersoll
http://www.grantingersoll.com/
http://lucene.grantingersoll.com
http://www.paperoftheweek.com/