Ah, I see. That is not at all parseable Turtle RDF. It really is just a list of 
URIs. You named the file ".ttl", but it is not proper Turtle:

https://en.wikipedia.org/wiki/Turtle_(syntax)#Example

There is a great deal of punctuation missing. I'm not at all sure why the 
example in the docs is printed that way. It won't work.

Perhaps someone who knows more about how the documentation is generated can 
comment? Perhaps that example was meant to acquire some formatting before 
publication?

---
A. Soroka
The University of Virginia Library

> On Oct 10, 2016, at 8:32 AM, Michal Krajňanský <michal.krajnan...@gmail.com> 
> wrote:
> 
> Dear Mr. Soroka,
> 
> Sorry for the mistake, trying again -- please find the attached file.
> 
> As you can find, I took over the example from Stanbol web:
> https://stanbol.apache.org/docs/trunk/components/enhancer/chains/executionplan.html
> and copied the prefix declarations from here:
> https://stanbol.apache.org/docs/trunk/components/enhancer/chains/graphchain.html
> 
> Thank you for looking into this!
> 
> Michal Krajnansky
> 
> 
> On Mon, Oct 10, 2016 at 2:23 PM A. Soroka <aj...@virginia.edu> wrote:
> That RDF quote didn't come through the mailing list (at least not for me). It 
> became a list of URIs. Perhaps you can try pasting it as very plain text? Or 
> you could put it in Gist or some other pastebin service?
> 
> 
> 
> ---
> 
> A. Soroka
> 
> The University of Virginia Library
> 
> 
> 
> > On Oct 10, 2016, at 5:22 AM, Michal Krajňanský 
> > <michal.krajnan...@gmail.com> wrote:
> 
> >
> 
> > Dear Stanbol Users,
> 
> >
> 
> > I have been experimenting with the system and I would appreciate your help
> 
> > with the following problem.
> 
> >
> 
> > I am trying to implement a custom Graph chain like the example here:
> 
> > https://stanbol.apache.org/docs/trunk/components/enhancer/chains/executionplan.html
> 
> > and here:
> 
> > https://stanbol.apache.org/docs/trunk/components/enhancer/chains/graphchain.html
> 
> >
> 
> > However, when trying to invoke the chain, I get the following exception:
> 
> >
> 
> > *org.apache.jena.riot [line: 6, col: 1 ] Undefined prefix: urn*
> 
> >
> 
> >
> 
> > My execution plan RDF looks like this:
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> >
> 
> > *@prefix xsd: <http://www.w3.org/2001/XMLSchema#
> 
> > <http://www.w3.org/2001/XMLSchema#>> .@prefix rdf:
> 
> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#
> 
> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#>> .@prefix ep:
> 
> > <http://stanbol.apache.org/ontology/enhancer/executionplan#
> 
> > <http://stanbol.apache.org/ontology/enhancer/executionplan#>> .@prefix ehp:
> 
> > <http://stanbol.apache.org/ontology/enhancementproperties#
> 
> > <http://stanbol.apache.org/ontology/enhancementproperties#>>
> 
> > .urn:execPlan    rdf:type ep:ExecutionPlan    ep:hasExecutionNode
> 
> > urn:node1, urn:node2, urn:node3, urn:node4, urn:node5    ep:chain
> 
> > "demoChain"urn:node1    rdf:type stanbol:ExecutionNode
> 
> > ep:inExecutionPlan urn:execPlan    ep:engine langIdurn:node2    rdf:type
> 
> > ep:ExecutionNode    ep:inExecutionPlan urn:execPlan    ep:dependsOn
> 
> > urn:node1    ep:engine nerurn:node3    rdf:type ep:ExecutionNode
> 
> > ep:inExecutionPlan urn:execPlan    ep:dependsOn urn:node1    ep:engine
> 
> > dbpediaLinkingurn:node4    rdf:type ep:ExecutionNode    ep:inExecutionPlan
> 
> > urn:execPlan    ep:dependsOn urn:node1    ep:engine
> 
> > geonamesLinkingurn:node5    rdf:type ep:ExecutionNode    ep:inExecutionPlan
> 
> > urn:execPlan    ep:engine zemanta    ep:optional "true"^^xsd:boolean*
> 
> >
> 
> > Thank you in advance for your kind help.
> 
> >
> 
> > Best Regards,
> 
> >
> 
> >
> 
> > Michal Krajnansky
> 
> 
> 
> <example-chain.ttl>

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