Re: Q. about RDFDataMgr & BadURIException
On 10/9/14 3:39 AM, "Andy Seaborne" wrote:
>Nicolas,
>
>Which version of Jena are you referring to? (the line number for
>RDFDataMgr does not seem to line up).
This is from the 2.11.2 version of jena-arq
In the git master branch, the corresponding code is at line 1331:
private static void write$(OutputStream out, DatasetGraph dataset,
RDFFormat serialization)
{
WriterDatasetRIOT w = createDatasetWriter$(serialization) ;
w.write(out, dataset, RiotLib.prefixMap(dataset), null, null) ; //
line 1331
}
>And what's the data being serialized? There is some BananaDRF
>processing applied to the data read in teh example. Could you provide
>(N-Triples is quite forgiving) the data or a short, standalone program
>that can produce it?
The test was originally written like this:
"write simple graph as TURTLE string" in {
val turtleString = writer.asString(referenceGraph,
"http://www.w3.org/2001/sw/RDFCore/";).get
turtleString should not be ('empty)
val graph = Await.result(reader.read(turtleString, rdfCore),
Duration(1, SECONDS))
assert(referenceGraph isIsomorphicWith graph)
}
At this point, "referenceGraph" is well-formed: every URI is absolute
{http://www.w3.org/2001/sw/RDFCore/ntriples/
@http://purl.org/dc/elements/1.1/publisher http://www.w3.org/;
http://www.w3.org/2001/sw/RDFCore/ntriples/
@http://purl.org/dc/elements/1.1/creator "Art Barstow";
http://www.w3.org/2001/sw/RDFCore/ntriples/
@http://purl.org/dc/elements/1.1/creator "Dave Beckett"}
When writer.asString() executes, it calls this:
def asString(graph: Jena#Graph, base: String): Try[String] = Try {
val result = new StringWriter()
import org.w3.banana.jena.Jena.ops._
val relativeGraph : Jena#Graph = graph.relativize(URI(base))
RDFDataMgr.write(result, relativeGraph, lang)
result.toString()
}
graph.relativize() is a banana-rdf API -- it constructs a new Jena Graph:
{ntriples/ @http://purl.org/dc/elements/1.1/creator "Dave Beckett";
ntriples/ @http://purl.org/dc/elements/1.1/creator "Art Barstow";
ntriples/ @http://purl.org/dc/elements/1.1/publisher http://www.w3.org/}
As I mentioned above, the Jena API RDFDataMgr.write() does not provide a
way to pass a base URI for the graph.
So given a relative Jena Graph as input, we get the serialization of that
graph which is also relative (as the value of the "result" string writer:
"Dave Beckett" ,
"Art Barstow" ;
Re: jena-text and persistent lucene index
On Fri, Oct 10, 2014 at 4:01 AM, Andy Seaborne wrote: > > How do you know it does not work? The code (groovy?) does not read the > index. Hey Andy, I had written a separate reader program to test using the index for queries. I did it that way to make sure I was seeing results from using the index, and not accidentally getting something that was cached in RAM or something. Anyway, as it turns out, I managed to solve the problem. As best as I can tell, the issue was this, or something close: The first time(s) I ran this program, I didn't yet have a dir.close() line in there to close the Lucene Directory. As a result, I was getting an incomplete Lucene index. Later, after I fixed that, I kept running the program but since I was creating the exact same triples (and not deleting the TDB dir between runs) Jena-Text didn't reindex those triples since they already existed. Perhaps you (or someone) can confirm if this is the way Jena Text would behave in that regard? Anyway, once I deleted my TDB store and started from scratch, everything worked exactly as expected. Thanks! Phil
Re: How to get all leaf subclass nodes in class view
在 2014年10月10日 22:25, Joshua TAYLOR 写道:
Are you asking how to get classes that don't have any (declared,
nontrivial, etc.) subclasses? You could do that with the Jena Model
API, but a SPARQL query here would be *very* simple:
select ?class where {
?leaf a rdfs:Class .
filter not exists { ?subleaf rdfs:subClassOf ?leaf }
}
Yes.
I don't find a convenient Jena Model API to do that. But the above
SPARQL query is really very simple.
Thank you very much.
On Fri, Oct 10, 2014 at 10:11 AM, Deyan Chen wrote:
在 2014年10月10日 19:40, Joshua TAYLOR 写道:
On Thu, Oct 9, 2014 at 11:23 PM, Deyan Chen wrote:
class view
What is class view?
Maybe my expression is not right. It means class hierarchical structure in
an ontology schema.
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Re: How to get all leaf subclass nodes in class view
Are you asking how to get classes that don't have any (declared,
nontrivial, etc.) subclasses? You could do that with the Jena Model
API, but a SPARQL query here would be *very* simple:
select ?class where {
?leaf a rdfs:Class .
filter not exists { ?subleaf rdfs:subClassOf ?leaf }
}
On Fri, Oct 10, 2014 at 10:11 AM, Deyan Chen wrote:
> 在 2014年10月10日 19:40, Joshua TAYLOR 写道:
>>
>> On Thu, Oct 9, 2014 at 11:23 PM, Deyan Chen wrote:
>>>
>>> class view
>>
>> What is class view?
>
> Maybe my expression is not right. It means class hierarchical structure in
> an ontology schema.
>
>>
>
> ---
> Confidentiality Notice: The information contained in this e-mail and any
> accompanying attachment(s) is intended only for the use of the intended
> recipient and may be confidential and/or privileged of Neusoft Corporation,
> its subsidiaries and/or its affiliates. If any reader of this communication
> is not the intended recipient, unauthorized use, forwarding, printing,
> storing, disclosure or copying is strictly prohibited, and may be
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Re: How to get all leaf subclass nodes in class view
在 2014年10月10日 19:40, Joshua TAYLOR 写道: On Thu, Oct 9, 2014 at 11:23 PM, Deyan Chen wrote: class view What is class view? Maybe my expression is not right. It means class hierarchical structure in an ontology schema. --- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---
RE: Using Fuseki 2 as a web application
I had done a git clone from the jena project on github. It looks like the last commit was on Oct. 3. I just did a new fetch so I'll see if it makes any difference. I haven't tried starting the server with a dataset that uses TDB. When I try to "Add New Dataset" clicking on the button just turns the background of the button white (I’m running a recent version of Chrome). I won't really be able to much more testing until next week but we're hosting a VIVO hackathon on Monday/Tuesday so I think there will be some interest. -Original Message- From: Andy Seaborne [mailto:a...@apache.org] Sent: Friday, October 10, 2014 5:43 AM To: users@jena.apache.org Subject: Re: Using Fuseki 2 as a web application On 09/10/14 20:35, John A. Fereira wrote: > Hijacking an old thread > > I've been playing around with the jena-fuseki2 code (from a recent clone of > the jena git repository) and have made pretty good progress getting it to > work with SDB, using the ReconnectingSDB jar file > (https://github.com/shellac/ReconnectingSDB). On my laptop (windows 7), I > have a configuration which connects to a SDB and deploys successfully into > Tomcat. Although there are quite a few broken links in the UI, I can execute > sparql select queries and get valid results. Now here's the weird part. If > I copy all the code over to a linux box, everything seems to work. It > deploys into tomcat but when I go to the web app it doesn't seem to recognize > that any datasets are available. The logger output looks identical to what I > am seeing on my laptop (no errors, /ds was registered as a dataset) but > the app doesn't think it's available. > > Any ideas? > Hi John, What happens if you start empty, and create a dataset? Then restart the server ... is that dataset still there? i.e without SDB, do things work? (and which code are you running from? ) Andy PS I'm just in the process of adding Fuseki2 the nightly development builds.
Re: How to get all leaf subclass nodes in class view
On Thu, Oct 9, 2014 at 11:23 PM, Deyan Chen wrote: > class view What is class view? -- Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
Re: Using Fuseki 2 as a web application
On 09/10/14 20:35, John A. Fereira wrote: Hijacking an old thread I've been playing around with the jena-fuseki2 code (from a recent clone of the jena git repository) and have made pretty good progress getting it to work with SDB, using the ReconnectingSDB jar file (https://github.com/shellac/ReconnectingSDB). On my laptop (windows 7), I have a configuration which connects to a SDB and deploys successfully into Tomcat. Although there are quite a few broken links in the UI, I can execute sparql select queries and get valid results. Now here's the weird part. If I copy all the code over to a linux box, everything seems to work. It deploys into tomcat but when I go to the web app it doesn't seem to recognize that any datasets are available. The logger output looks identical to what I am seeing on my laptop (no errors, /ds was registered as a dataset) but the app doesn't think it's available. Any ideas? Hi John, What happens if you start empty, and create a dataset? Then restart the server ... is that dataset still there? i.e without SDB, do things work? (and which code are you running from? ) Andy PS I'm just in the process of adding Fuseki2 the nightly development builds.
Re: jena-text and persistent lucene index
Phil,
How do you know it does not work? The code (groovy?) does not read the
index. Could you provide a complete example (I don't have groovy
installed ATM).
(which version are you using?)
Andy
On 10/10/14 01:50, Phillip Rhodes wrote:
Jena crew:
I have Jena-Text pretty much working for what I want to do, but with
one caveat... it only seems to work with the Lucene RamDirectory. If
I use a persistent dir, I don't find any documents being written to
the Lucene index. Any help or suggestions are greatly appreciated.
Code sample follows:
---CODE---
package org.fogbeam.example.jenatext
import org.apache.jena.query.text.EntityDefinition
import org.apache.jena.query.text.TextDatasetFactory
import org.apache.jena.query.text.TextQuery
import org.apache.lucene.store.Directory
import org.apache.lucene.store.FSDirectory
import com.hp.hpl.jena.query.Dataset
import com.hp.hpl.jena.query.ReadWrite
import com.hp.hpl.jena.rdf.model.Model
import com.hp.hpl.jena.rdf.model.Resource
import com.hp.hpl.jena.rdf.model.Statement
import com.hp.hpl.jena.tdb.TDBFactory
import com.hp.hpl.jena.vocabulary.RDFS
class JenaTextMain6Write
{
static main(args)
{
TextQuery.init();
EntityDefinition entDef = new EntityDefinition("uri", "text",
RDFS.label.asNode()) ;
// Lucene, in memory.
Directory dir = FSDirectory.open( new File( "jenastore/index" ) );
// Join together into a dataset
Dataset tdbDataset = TDBFactory.createDataset("jenastore/triples");
Dataset ds = TextDatasetFactory.createLucene(tdbDataset, dir, entDef);
try
{
ds.begin(ReadWrite.WRITE);
Model m = ds.getDefaultModel();
Resource rSubject = m.createResource(
"http://ontology.fogbeam.com/example/TestResource1"; );
Resource rSubject2 = m.createResource(
"http://ontology.fogbeam.com/example/TestResource2"; );
Statement s = m.createStatement(rSubject, RDFS.label,
"This is a Test Resource" );
m.add( s );
Statement s2 = m.createStatement(rSubject2, RDFS.label,
"Bratwurst Test" );
m.add( s2 );
ds.commit();
dir.close();
}
catch( Exception e )
{
e.printStackTrace();
ds.abort();
}
finally
{
if( ds != null )
{
ds.end();
}
}
println "done";
}
}
--- END CODE---
Phil
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