Re: Stanbol SPARQL and RelFinder

Sebastian Hellmann Wed, 26 Jun 2013 23:28:24 -0700

Hi Steven,




Am 13.06.2013 21:35, schrieb Isley, Steven:

Hi Sebastian,

I finally managed some more time to work on this. I've run into good and bad news: the 
good news is that sometimes RelFinder will find non-trivial paths (something more 
complicated than "a and b both have some relationship to c") but the results 
are somewhat wonky and I don't think it finds all of them that it should. See the end of 
this email for the example RDF data that I'm using.

     This query correctly returns document-1 when executed on the Stanbol 
SPARQL endpoint:
SELECT * WHERE {
?middle ?pf1 <http://some.org/people/person-1>  .
?middle ?ps1 <http://some.org/people/person-2>  .
} LIMIT 10

     And the following query correctly returns document-2
SELECT * WHERE {
?middle ?pf1 <http://some.org/people/person-2>  .
?middle ?ps1 <http://some.org/people/person-3>  .
} LIMIT 10

    The following query also works, however, I don't see it as one of the 
Relfinder queries specified in [1]:
SELECT * WHERE {
?middle ?pf1 <http://some.org/people/person-1> .
?os1 ?ps1 <http://some.org/people/person-3> .
?os1 ?ps2 ?os2 .
?middle ?ps3 ?os2 .
} LIMIT 10

Should the above query be included in Relfinder for max relation lengths > 4, 
and if so, any tips on how to modify relfinder? As it stands, the RDF DATA VERSION 
1 does have a path connecting persons 1 and 3, but Relfinder doesn't find it.

When we created relfinder, triple stores where not that fast, so weskipped queries with changing directions. So it was either:

a -> b -> c -> middle
or
middle -> c -> b -> a
but not
a -> b <- c -> middle

now it might make sense to change this, as stores are getting faster.Actually, SPARQL 1.1. might have some features such as property paths:http://www.w3.org/TR/sparql11-property-paths/

that might be even better. I didn't investigate this yet.


Also, if I modify the rdf data to include inverse author properties (see RDF DATA VERSION 
2) then RelFinder correctly finds the path through the document from person 1 to person 3, 
but starts adding spurious links when I search between person 1 and person 2. For instance, 
it includes author and creator arrows going both ways, like document 1 -> creator -> 
person2 AND document1 -> author -> person 2. The last statement isn't correct and 
isn't included in the RDF. I've attached a screenshot.


Hm, not so sure, why it does this. I have added an issue at relfinder:
http://code.google.com/p/relfinder/issues/detail?id=50

all the best,
Sebastian

-----Original Message-----
From: Sebastian Hellmann [mailto:hellm...@informatik.uni-leipzig.de]
Sent: Thursday, June 06, 2013 10:02 PM
To: dev@stanbol.apache.org
Cc: Isley, Steven
Subject: Re: Stanbol SPARQL and RelFinder

Wouldn't it be the most effective thing to make a unit test?
I can help write and generate/check the queries, if you give us your example 
data.
In the end, we probably just need to create examples of different lengths on 
DBpedia and then download and merge  the data into one file and create queries 
of different lengths.
What examples are you using?
Sebastian

Am 05.06.2013 21:56, schrieb Isley, Steven:

I get results for the first query (as usual), but no results for the second 
query. However, before updating Clerezza, I would get an 'invalid query' 
response from Stanbol's sparql query page, now I just get no results. My graph 
definitely contains results for the second query - and for many other queries 
more complicated than that one. RelFinder looks for all sorts of paths 
connecting two entities, I just picked one of the simpler ones for 
demonstration purposes.

-steve

-----Original Message-----
From: Reto Bachmann-Gmür [mailto:r...@apache.org]
Sent: Wednesday, June 05, 2013 10:08 AM
To: dev@stanbol.apache.org
Subject: Re: Stanbol SPARQL and RelFinder

Hi Steven

To make sure I understand: You are still getting results for:

SELECT * WHERE {
<Target Person 1 URI> ?pf1 ?middle .
<Target Person 2 URI> ?ps1 ?os1 .
} LIMIT 10

but no result for

SELECT * WHERE {
<Target Person 1 URI> ?pf1 ?middle .
<Target Person 2 URI> ?ps1 ?os1 .
?os1 ?ps2 ?middle .
}

However, your graph contains triples that satisfy the latter?

Cheers,
Reto



On Wed, Jun 5, 2013 at 6:48 PM, Isley, Steven <sis...@prgs.edu> wrote:

Update on RelFinder integration,

I recompiled Stanbol using the latest and greatest snapshot of
Clerezza. I updated every reference to it I could find in all the
pom.xml and list.xml files I could find. I started up a fresh copy of
Stanbol and loaded it with my rdf data. The SPARQL endpoint no longer
returns an error, but it also doesn't return any results (beyond the original, 
direct connections - i.e.
two people both authored a document together).

I don't know if this is because of unrelated changes in the new
version of Clerezza causing problems, or the CLEREZZA-787 update not
entirely fixing the bug.

I lack the time and know-how to hunt this down, but thought others
might want to know how far I got. The relevant portion (I think) of
the Stanbol error log is attached.

Thanks for everyone's help thus far.

-steve

-----Original Message-----
From: Reto Bachmann-Gmür [mailto:r...@apache.org]
Sent: Tuesday, June 04, 2013 12:41 PM
To: dev@stanbol.apache.org
Subject: Re: Stanbol SPARQL and RelFinder

Hi Steve

Basically you have to change the versions in the list.xml files. Not
sure if you can just update rdf.jena.facade or if this implies updati
a lot of clerezza andd jena bundes. If the later is the case your
work will result in a valuable patch for Stanbol.

Cheers,
Reto


On Tue, Jun 4, 2013 at 6:42 PM, Isley, Steven <sis...@prgs.edu> wrote:

Hi Reto,

Sorry for the newbie question, but what is the best way to go about
integrating an updated external component like Clerezza into Stanbol?
I'm very new to Maven and OSGi and struggling with getting my head
around such a large project. I'm also unfortunately working in a
Windows environment, but I'm trying to find a way to switch.

I'm currently downloading the Clerezza source and will try compiling
it on my machine, but how do I make Stanbol use it?

Thanks for any help.

-steve

-----Original Message-----
From: m...@farewellutopia.com [mailto:m...@farewellutopia.com] On Behalf
Of Reto Bachmann-Gmür
Sent: Tuesday, June 04, 2013 2:53 AM
To: dev@stanbol.apache.org
Cc: clerezza-...@incubator.apache.org
Subject: Re: Stanbol SPARQL and RelFinder

Glad you found the video useful.

Let me know if things work when using the snapshot clerezza bundles.

Reto


On Mon, Jun 3, 2013 at 6:25 PM, Isley, Steven <sis...@prgs.edu> wrote:

Thanks Reto!

I will check that this fixed the problem in a day or two, then send
out a few more details on how to integrate RelFinder for anybody
else that is interested.

Also, thanks for the video you put together for using Stanbol with
Netbeans. I'm trying to use Eclipse, and the video has gotten me
most of the way there!

-steve

[1] http://vimeo.com/61415903

-----Original Message-----
From: m...@farewellutopia.com [mailto:m...@farewellutopia.com] On
Behalf Of Reto Bachmann-Gmür
Sent: Monday, June 03, 2013 8:49 AM
To: dev@stanbol.apache.org
Cc: clerezza-...@incubator.apache.org
Subject: Re: Stanbol SPARQL and RelFinder

I resolved CLEREZZA-787. I hope this resolves the problem.

Cheers,
Reto


On Mon, Jun 3, 2013 at 5:39 PM, Reto Bachmann-Gmür
<r...@wymiwyg.com>
wrote:

Hi rupert, Isley,

Yes the excpetion ios thrown in the implementation of
ExtendedIterator
com.hp.hpl.jena.graph.impl.GraphBase#graphBaseFind(TripleMatch
m) when the subject in m is a literal. I think it would be safe to
return

an empty iterator if this case.

Cheers,
Reto


On Mon, Jun 3, 2013 at 9:45 AM, Rupert Westenthaler <
rupert.westentha...@gmail.com> wrote:

Hi Isley, Clerezza community

this seams to be related to an issue in the Clerezza SPARQL
implementation. I think the problem is that the "Jena <-> Clerezza"
Adapter enforces that subjects of triples need to be NonLiterals,
but the last statement of your Sparql Query. An assumption that
MUST NOT be true for SPARQL query results where resources in any
position (subject, predicate, object) can have any type (Literal,
URI or bNode).

This query

SELECT * WHERE {
<Target Person 1 URI> ?pf1 ?middle .
<Target Person 2 URI> ?ps1 ?os1 .
?os1 ?ps2 ?middle .
} LIMIT 10

does exactly that, as it uses values ( 'os1') of '<Target Person
2
URI> ?ps1 ?os1' as first argument (subject) for an second join
URI> '?os1
?ps2 ?middle'.

Would be nice if someone with more knowledge about the Clerezza
SPARQL implementation could look into that.

best
Rupert



On Fri, May 31, 2013 at 7:17 PM, Isley, Steven <sis...@prgs.edu>

wrote:

Hello everyone,

I've been trying to integrate Apache Stanbol and Relfinder[1]
(my two

favorite demos to show people who have never heard of the
semantic web). I ran into some problems with Relfinder that I
think

I fixed.

It was using a different parameter name to specify the graph to
use in

the SPARQL query.

After recompiling Relfinder to work with Stanbol, I've run into
some other errors which may be Stanbol related.

Relfinder tries to find paths through a dataset that link two

nodes.

I've uploaded an rdf data set to a clerezza managed site. The
data consists of documents, their authors, and then some other
information (such as an author's department, or a document's
publish date). I've got about 500k triples.

My version of Relfinder will find some links between nodes.
Like if the

two input nodes are people, it will find documents they both
authored, or departments they both belong to. However, the more
impressive searches result in an "Error 500 cannot convert {one
of my URIs} to NonLiteral" (see end of email for full error

message).

Using firebug to monitor the network requests shows that this
error occurs for all the searches that are supposed to return the
more complicated results (Target Person 1 authored document X,
also authored by person B, that authored document Y, that was
also authored by Target Person
2)

I spent some time playing with Stanbol's SPARQL endpoint, and
the

simplest example that reproduces the error is:

SELECT * WHERE {
<Target Person 1 URI> ?pf1 ?middle .
<Target Person 2 URI> ?ps1 ?os1 .
?os1 ?ps2 ?middle .
} LIMIT 10

However, the following query works fine:
SELECT * WHERE {
<Target Person 1 URI> ?pf1 ?middle .
<Target Person 2 URI> ?ps1 ?os1 .
} LIMIT 10

Note that these are simplified searches, the actual Relfinder
queries

are more complicated, and attempt to filter out literal values.
See the very, very end of this email for the original query.
Relfinder works fine on other SPARQL endpoints, like dbpedia's.

Thanks for any insights you can offer on this problem. The help
is much

appreciated.

--
Steven Isley
Ph.D. Candidate
Pardee RAND Graduate School
RAND Corporation
ph: (310)393-0411 x6643

-Steve Isley

   [1] http://www.visualdataweb.org/relfinder.php


p.s. - if anyone else is trying to use RelFinder, I also ran
into

issues with CPU usage. Sometimes Stanbol would overrun the cpu
limit on my server and would be silently killed. Took me a while
to figure that one out! I managed to get around this using
"unlimit cpu" - but the IT folks at my workplace will probably
come down on me for that
:)

Error Output:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;

charset=ISO-8859-1"/>

<title>Error 500 cannot convert "{the rdfs:label for Person 1}"
to

NonLiteral</title>

</head>
<body><h2>HTTP ERROR 500</h2> <p>Problem accessing /sparql.
Reason:
<pre>    cannot convert "{the rdfs:label for Person 1}" to

NonLiteral</pre></p><h3>Caused

by:</h3><pre>java.lang.RuntimeException:

cannot convert "{the rdfs:label for Person 1}"to NonLiteral

at

org.apache.clerezza.rdf.jena.commons.Jena2TriaUtil.convertNonLi
te
ra
l(
Jena2TriaUtil.java:127)

at

org.apache.clerezza.rdf.jena.facade.JenaGraph.filter(JenaGraph.
ja
va
:1
23)

at

org.apache.clerezza.rdf.jena.facade.JenaGraph.graphBaseFind(Jen
aG
ra
ph
.java:151)

at

com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:240)

at

com.hp.hpl.jena.graph.impl.GraphBase.graphBaseFind(GraphBase.ja
va
:2
60
)

at

com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:257)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterTriplePattern$T
ri
pl
eM
apper.&lt;init&gt;(QueryIterTriplePattern.java:67)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterTriplePattern.n
ex
tS
ta
ge(QueryIterTriplePattern.java:41)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.mak
eN
ex
tS
tage(QueryIterRepeatApply.java:91)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.has
Ne
xt
Bi
nding(QueryIterRepeatApply.java:52)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNex
t(
Qu
er
yIteratorBase.java:66)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterBlockTriples.ha
sN
ex
tB
inding(QueryIterBlockTriples.java:53)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNex
t(
Qu
er
yIteratorBase.java:66)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIterSlice.hasNextBi
nd
in
g(
QueryIterSlice.java:64)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNex
t(
Qu
er
yIteratorBase.java:66)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.has
Ne
xt
Bi
nding(QueryIteratorWrapper.java:28)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNex
t(
Qu
er
yIteratorBase.java:66)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.has
Ne
xt
Bi
nding(QueryIteratorWrapper.java:28)

at

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNex
t(
Qu
er
yIteratorBase.java:66)

at

com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSet
St
re
am
.java:57)

at

org.apache.clerezza.rdf.jena.sparql.ResultSetWrapper.&lt;init&g
t;
(R
es
ultSetWrapper.java:39)

at

org.apache.clerezza.rdf.jena.sparql.JenaSparqlEngine.execute(Je
na
Sp
ar
qlEngine.java:68)

at

org.apache.clerezza.rdf.core.access.TcManager.executeSparqlQuer
y(
Tc
Ma
nager.java:272)

at

org.apache.stanbol.commons.web.sparql.resource.SparqlEndpointRe
so
ur
ce
.sparql(SparqlEndpointResource.java:162)

at

org.apache.stanbol.commons.web.sparql.resource.SparqlEndpointRe
so
ur
ce
.postSparql(SparqlEndpointResource.java:182)

          at
sun.reflect.GeneratedMethodAccessor39.invoke(Unknown

Source)

at

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho
dA
cc
es
sorImpl.java:43)

          at java.lang.reflect.Method.invoke(Method.java:616)
          at

com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(
Ja
va
Me
thodInvokerFactory.java:60)

at

com.sun.jersey.server.impl.model.method.dispatch.AbstractResour
ce
Me
th
odDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourc
eM
et
ho
dDispatchProvider.java:205)

at

com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMe
th
od
Di
spatcher.dispatch(ResourceJavaMethodDispatcher.java:75)

at

com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(Http
Me
th
od
Rule.java:302)

at

com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(R
es
ou
rc
eClassRule.java:108)

at

com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(R
ig
ht
Ha
ndPathRule.java:147)

at

com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.ac
ce
pt
(R
ootResourceClassesRule.java:84)

at

com.sun.jersey.server.impl.application.WebApplicationImpl._hand
le
Re
qu
est(WebApplicationImpl.java:1480)

at

com.sun.jersey.server.impl.application.WebApplicationImpl._hand
le
Re
qu
est(WebApplicationImpl.java:1411)

at

com.sun.jersey.server.impl.application.WebApplicationImpl.handl
eR
eq
ue
st(WebApplicationImpl.java:1360)

at

com.sun.jersey.server.impl.application.WebApplicationImpl.handl
eR
eq
ue
st(WebApplicationImpl.java:1350)

at

com.sun.jersey.spi.container.servlet.WebComponent.service(WebCo
mp
on
en
t.java:416)

at

com.sun.jersey.spi.container.servlet.ServletContainer.service(S
er
vl
et
Container.java:538)

at

com.sun.jersey.spi.container.servlet.ServletContainer.service(S
er
vl
et
Container.java:716)

at

javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at

org.apache.felix.http.base.internal.handler.ServletHandler.doHa
nd
le
(S
ervletHandler.java:96)

at

org.apache.felix.http.base.internal.handler.ServletHandler.hand
le
(S
er
vletHandler.java:79)

at

org.apache.felix.http.base.internal.dispatch.ServletPipeline.ha
nd
le
(S
ervletPipeline.java:42)

at

org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.
do
Filter(InvocationFilterChain.java:49)

at

org.apache.felix.http.base.internal.dispatch.HttpFilterChain.do
Fi
lt
er
(HttpFilterChain.java:33)

at

org.apache.felix.http.base.internal.handler.FilterHandler.handl
e(
Fi
lt
erHandler.java:78)

at

org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.
do
Filter(InvocationFilterChain.java:47)

at

org.apache.felix.http.base.internal.dispatch.HttpFilterChain.do
Fi
lt
er
(HttpFilterChain.java:33)

at

org.apache.stanbol.commons.httpqueryheaders.impl.QueryHeadersFi
lt
er
.d
oFilter(QueryHeadersFilter.java:75)

at

org.apache.felix.http.base.internal.handler.FilterHandler.doHan
dl
e(
Fi
lterHandler.java:88)

at

org.apache.felix.http.base.internal.handler.FilterHandler.handl
e(
Fi
lt
erHandler.java:76)

at

org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.
do
Filter(InvocationFilterChain.java:47)

at

org.apache.felix.http.base.internal.dispatch.HttpFilterChain.do
Fi
lt
er
(HttpFilterChain.java:33)

at

org.apache.stanbol.commons.web.resources.ResourceServingFilter.
do
Fi
lt
erHttp(ResourceServingFilter.java:148)

at

org.apache.stanbol.commons.web.resources.ResourceServingFilter.
do
Fi
lt
er(ResourceServingFilter.java:91)

at

org.apache.felix.http.base.internal.handler.FilterHandler.doHan
dl
e(
Fi
lterHandler.java:88)

at

org.apache.felix.http.base.internal.handler.FilterHandler.handl
e(
Fi
lt
erHandler.java:76)

at

org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.
do
Filter(InvocationFilterChain.java:47)

at

org.apache.felix.http.base.internal.dispatch.HttpFilterChain.do
Fi
lt
er
(HttpFilterChain.java:33)

at

org.apache.stanbol.commons.security.auth.AuthenticatingFilter$1
.r
un
(A
uthenticatingFilter.java:163)

          at java.security.AccessController.doPrivileged(Native

Method)

at

javax.security.auth.Subject.doAsPrivileged(Subject.java:537)

at

org.apache.stanbol.commons.security.auth.AuthenticatingFilter.d
oF
il
te
r(AuthenticatingFilter.java:159)

at

org.apache.felix.http.base.internal.handler.FilterHandler.doHan
dl
e(
Fi
lterHandler.java:88)

at

org.apache.felix.http.base.internal.handler.FilterHandler.handl
e(
Fi
lt
erHandler.java:76)

at

org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.
do
Filter(InvocationFilterChain.java:47)

at

org.apache.felix.http.base.internal.dispatch.HttpFilterChain.do
Fi
lt
er
(HttpFilterChain.java:33)

at

org.apache.felix.http.base.internal.dispatch.FilterPipeline.dis
pa
tc
h(
FilterPipeline.java:48)

at

org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatc
h(
Di
sp
atcher.java:39)

at

org.apache.felix.http.base.internal.DispatcherServlet.service(D
is
pa
tc
herServlet.java:67)

at

javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at

org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.ja
va
:5
11
)

at

org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.
ja
va
:3
90)

at

org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.
ja
va
:1
82)

at

org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.
ja
va
:7
65)

at

org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.
ja
va
:1
52)

          at org.mortbay.jetty.Server.handle(Server.java:326)
          at

org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
54
2)

at

org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpCon
ne
ct
io
n.java:943)

at

org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)

at

org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218
)

at

org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404
)

at

org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.
ja
va:410)

at

org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThread
Po
ol
.j
ava:582)

</pre>
<hr /><i><small>Powered by Jetty://</small></i><br/> <br/> <br/>
<br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/>
<br/> <br/> <br/> <br/> <br/> <br/> <br/>

</body>
</html>


RelFinder Query:

SELECT * WHERE {
<http://dopma-ropma.rand.org/people/{Target Person 1}> ?pf1

?middle .

<http://dopma-ropma.rand.org/people/{Target Person 2}> ?ps1
?os1

?os1 ?ps2 ?middle .
FILTER (
     (?pf1 != <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
) &&
(?pf1 != <http://www.w3.org/2004/02/skos/core#subject> ) &&
(?pf1 != <http://www.w3.org/2002/07/owl#sameAs> ) && (?pf1 !=
<http://purl.org/dc/terms/subject> ) && (?pf1 !=
<http://purl.org/dc/terms/dateCopyrighted> ) && (?pf1 !=
<http://purl.org/dc/terms/title> ) && (?pf1 !=
<http://dopma-ropma.rand.org/people/employeeID2> ) && (?pf1 !=
<http://xmlns.com/foaf/0.1/mbox> ) && (?ps1 !=
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ) && (?ps1 !=
<http://www.w3.org/2004/02/skos/core#subject> ) && (?ps1 !=
<http://www.w3.org/2002/07/owl#sameAs> ) && (?ps1 !=
<http://purl.org/dc/terms/subject> ) && (?ps1 !=
<http://purl.org/dc/terms/dateCopyrighted> ) && (?ps1 !=
<http://purl.org/dc/terms/title> ) && (?ps1 !=
<http://dopma-ropma.rand.org/people/employeeID2> ) && (?ps1 !=
<http://xmlns.com/foaf/0.1/mbox> ) && (?ps2 !=
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ) && (?ps2 !=
<http://www.w3.org/2004/02/skos/core#subject> ) && (?ps2 !=
<http://www.w3.org/2002/07/owl#sameAs> ) && (?ps2 !=
<http://purl.org/dc/terms/subject> ) && (?ps2 !=
<http://purl.org/dc/terms/dateCopyrighted> ) && (?ps2 !=
<http://purl.org/dc/terms/title> ) && (?ps2 !=
<http://dopma-ropma.rand.org/people/employeeID2> ) && (?ps2 !=
<http://xmlns.com/foaf/0.1/mbox> ) &&
(!isLiteral(?middle)) && (?middle !=
<http://dopma-ropma.rand.org/people/{Target Person 1}>
) && (?middle != <http://dopma-ropma.rand.org/people/{Target
Person 2}> ) && (?middle != ?os1 ) && (!isLiteral(?os1)) &&
(?os1 != <http://dopma-ropma.rand.org/people/{Target Person 1}>
) &&
(?os1 != <http://dopma-ropma.rand.org/people/{Target Person 2}>
) &&
(?os1 != ?middle ) ).
} LIMIT 10

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Department of Computer Science, University of Leipzig
Events: NLP & DBpedia 2013 (http://nlp-dbpedia2013.blogs.aksw.org,
Deadline: *July 8th*)
Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
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Department of Computer Science, University of Leipzig
Events:

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* LSWT 23/24 Sept, 2013 in Leipzig (http://aksw.org/lswt)
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Re: Stanbol SPARQL and RelFinder

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