W3C home > Mailing lists > Public > public-lod@w3.org > September 2011

Re: Lightweight Java RDF libraries

From: Jean-Marc Vanel <jeanmarc.vanel@gmail.com>
Date: Mon, 12 Sep 2011 15:33:32 +0200
Message-ID: <CANwvFKDS3817_QByeUXgKhyUzYrjFMKUWm1XP2CV6TtcKwHjZw@mail.gmail.com>
To: Norman Gray <norman@astro.gla.ac.uk>
Cc: Linking Open Data <public-lod@w3.org>
Well, I was too optimistic about the jar dependencies.
There are 2 more jar necessary to run the code sample :
 136987  oscache-2.4.1.jar
  44598  commons-logging-api-1.1.jar

OSCache is used to cache the parsed RDF/N3; this is useful in the
context of a GUI , and it should be made facultative.

This rises the bytes to :
136987 + 44598 + 1031194 + 383791 + 481535
2,078,105

2011/9/12 Jean-Marc Vanel <jeanmarc.vanel@gmail.com>:
> That's a good question that I asked myself when I started EulerGUI.
> And I couldn't also find a right answer.
> Then the project, geared towards GUI and rules, proceeded, and I
> forgot the question. We used Jena for parsing RDF/XML, OWL-API for
> OWL/XML.
> And for N3 including quoted graphs and rules, we built a parser.
> Then , along the way , we built an API able to parse any RDF dialect (
> Turtle/N3, RDF/XML, OWL/XML, and more  ) .
> Here is a sample:
>
>                SourceFactory factory = new SourceFactory();
>                N3Source n3 = factory.addSource(new URL(
>                  "https://eulergui.svn.sourceforge.net/svnroot/eulergui/trunk/eulergui/examples/parents.n3"),
> null);
>                ParserLink pl = new ParserLink();
>                pl.parse( n3 );
>                ListStorageTripleHandler handler = new ListStorageTripleHandler();
>                pl.visitAllURI( handler );
>                System.out.println( handler.getTriples() );
>                List<ITriple> triples = handler.getTriples();
>                System.out.println( triples );
>
> To do this , these 3 jar are needed :
>
> eulergui-1.9-SNAPSHOT.jar 1031194
> /home/jmv/.m2/repository/parser4j/all/trunk3/all-trunk3.jar 383791
> log4j-1.2.16.jar 481535
>
> which amounts to this total :
> 1031194 + 383791 + 481535
> 1,896,520 bytes
>
>
> 2011/9/12 Norman Gray <norman@astro.gla.ac.uk>:
>>
>> Greetings.
>>
>> Can anyone point me towards a simple/lightweight Java RDF library?
>>
>> Here, I mean 'lightweight' in the sense of having a small API, rather than a small jar, because if one is trying to persuade people that RDF is a useful and practical thing, then hauling out a manual which could crush a small donkey is a difficult place to start.  I want an RDF gateway drug^Wlibrary.
>>
>> All I really want to be able to (demonstrate I can) do is to read and write RDF/XML and Turtle, create triples, and iterate through a graph.   Simple inference I wouldn't say no to, but wouldn't need; and SPARQL would be unnecessary for the scope and userbase I have in mind.
>>
>> Ideally, I'd like to be able to say "here is a little jar to put on your classpath, and here is a webpage with a few examples which make simple things simple; have fun".
>>
>> Jena I've used a lot, and like, but ... well, see remarks about maltreated donkeys above.  Sesame I've used less, but it's still a four-types-of-batteries included solution.
>>
>> JRDF <http://jrdf.sourceforge.net/> is I think intended to be small, but looking at its documentation, it seems to have become fuller-featured over time.  Also, it's marked as 'inactive', which is nudging one away from using it for new projects.
>>
>> rdf2go looks attractive, and seems to be aimed in part at the same semweb-sceptical userbase.  But as an abstraction layer over other triple stores, it fails my 'one jar' goal.
>>
>> I imagine it would be possible to try to extract some some sort of bare-bones Jena subset, but I can't help thinking that would be quite a lot of work (I haven't looked at the feasibility in any detail).
>>
>> Yes, disk space is cheap, and yes, I can' just write a "primer for sceptics" set of examples, but if there's a bare-bones librarylet knocking around, that I haven't found, then I'd like to use it, and I imagine the LOD list would know of it.
>>
>> Thanks for any pointers.
>>
>> All the best,
>>
>> Norman
>>
>>
>> --
>> Norman Gray  :  http://nxg.me.uk
>> SUPA School of Physics and Astronomy, University of Glasgow, UK
>>
>>
>>
>
>
> --
> Jean-Marc Vanel
> Déductions SARL - Consulting, services, training,
> Rule-based programming, Semantic Web
> http://jmvanel.free.fr/ - EulerGUI, a turntable GUI for Semantic Web +
> rules, XML, UML, eCore, Java bytecode
> +33 (0)6 89 16 29 52
> chat :  irc://irc.freenode.net#eulergui
>



-- 
Jean-Marc Vanel
Déductions SARL - Consulting, services, training,
Rule-based programming, Semantic Web
http://jmvanel.free.fr/ - EulerGUI, a turntable GUI for Semantic Web +
rules, XML, UML, eCore, Java bytecode
+33 (0)6 89 16 29 52
chat :  irc://irc.freenode.net#eulergui
Received on Monday, 12 September 2011 13:33:59 UTC

This archive was generated by hypermail 2.3.1 : Sunday, 31 March 2013 14:24:35 UTC