Hi Reto, thank you very much for you quick and straight to the point reply. I have not had time to try the example out, but I'll come back here if I have problems when I do it.
Just a couple of comments/questions inline. On 6 November 2011 10:38, Reto Bachmann-Gmür <r...@apache.org> wrote: > Hi Paolo, > > Thanks for your interest in clerezza. > > >> I had just a quick look at the documentation on the website, but I'd like >> to learn how I could use the Clerezza "graph" APIs directly. >> >> Here is an example of how to parse an RDF Turtle file and write it out as >> N-Triples using the Jena Model APIs: >> >> ---- >> InputStream in = ...; >> Model model = ModelFactory.createDefaultModel(); >> Model model.read(in, null, "TURTLE"); >> model.write(System.out, "N-TRIPLES"); >> ---- >> >> Could you help me and guide me in writing a similar example using Clerezza? >> > > The above translates to: > > InputStream in = ...; > Parser parser = Parser.getInstance(); //in OSGi should get this from the > service registry instead > Graph g = parser.parse(in, SupportedFormat.TURTLE); > Serializer serializer = Serializer.getInstance(); //in OSGi should get this > from the service registry instead > serializer.serialize(System.out, g, SupportedFormat.N_TRIPLE); This is exactly what I was searching for, thanks. > > >> >> I think the org.apache.clerezza.rdf.core module only isn't enough, but I >> am not >> sure which module should I look at. > > Actually at compile time for the above rdf core is enough but at runtime > you need providers for serializing and parsing the requested formats. You > can use the following bundles/jars (in OSGi loaded as bundles otherwise in > your classpath): > - rdf.jena.serializer > - rdf.jena.parser Great, all clear. Thanks. > rdf-json is provided by > - rdf.rdfjson Is this for parsing and serialising RDF/JSON? Which RDF/JSON? I'll have a look at it, we now have support for RDF/JSON in Jena (but it has been added only recently therefore not many have been using/testing it). It's this [1] RDF/JSON. While the W3C agrees on what RDF/JSON should be. :-) [1] http://docs.api.talis.com/platform-api/output-types/rdf-json > >> The list of Clerezza modules is "extensive" [1]. Is there a map? :-) >> > no, but the locals very much like to give directions :-) > > for instance for rdf, rdf.core is a good place to start, but from there I > recommend walking uphill to rdf.utils which offers a resource centric view > of rdf data. From rdf.utils why not do a stroll over to rdf.scala.utils > which allow very compact syntax to browse rdf data in scala. To get you > started with scala cerezza can create a skeleton app for you. Just enter > the following on the clerezza console: > > zz>Dev create 'scala_with_activator in "/path/to/myproject" > > You'll have a hello-world at http://localhost:8080/hello-world and you can > modify its behaviour just by editing > /path/to/myproject/src/main/scala/HelloWorld.scala Good. Thanks. >> Java code and a small example would do. >> > The above generated hello-world is in scala, for an example using java see: > http://svn.apache.org/viewvc/incubator/clerezza/trunk/maven-archetypes/java-ssp-ttl/ > > >> >> [1] https://repository.apache.org/**content/repositories/** >> snapshots/org/apache/clerezza/<https://repository.apache.org/content/repositories/snapshots/org/apache/clerezza/> >> > > You have the bundle twice there, as it als contains the old artifact names > starting with org.apache.clerezza Oh... good to know. I think I was using the old ones (i.e. org.apache.clerezza) (by mistake). Paolo > > Cheers, > Reto >
