LarKC Tutorial at ISWC 2009 - Second Hands-on Scenario

Cyc-Gate workflow Blaz Fortuna, Luka Bradesko Cycorp Europe, Slovenia

Goal
Demonstrate reasoning over non-structured input data
Learn how to correctly annotate a new plug-in
Learn how to add a new plug-in to the platform

External tools useds
GATE
Information Extraction framework
Used here for extraction of named entities from articles
ResearchCyc
Common-sense knowledge base
~300,000 concepts, 1.3M assertions
Reasoning engine

Pipeline diagram Research Cyc GATE Internet Query Identify Transform Select Reason Result

Example

Query PREFIX cyc: <http://www.cycfoundation.org/concepts/> SELECT ?company WHERE { ?company cyc:mentionedInArticle " http://shodan.ijs.si:8080/GateServer/news.txt " . ?company cyc:isa cyc:PubliclyHeldCorporation }

Identify
Find links to html documents and retrieve them using ArticleIdentifier plugin.
Returns a text document:
http://shodan.ijs.si:8080/GateServer/news.txt

Transform
Use GATE to extract organizations
Retruns SetOfStatements of style:
article-0 urn:hasUrl “http://shodan.ijs.si:8080/GateServer/news.txt " company-0 urn:nameString “Microsoft” company-0 urn:mentionedInArticle article-0 company-1 urn:nameString “Ford” company-1 urn:mentionedInArticle article-0 … Query: … ?company cyc:mentionedInArticle "http://shodan.ijs.si:8080/GateServer/news.txt" …

Select
Select only the companies with corresponding concept in ResearchCyc KB
company-0 -> #$MicrosoftInc
company-1 -> #$FordMotors
Replace URIs with Cyc concepts
cyc:mentionedInArticle -> #$mentionedInArticle
Output:
#$MicrosoftInc #$ mentionedInArticle #$article-0 #$ FordMotors #$ mentionedInArticle #$article-0 …

Reason
Reason
Load the triples with Cyc concept names in ReasearchCyc KB
Transform SPARQL query to Cyc query
Execute and retrieve results

Run the workflow on your computer! Main class: eu.larkc.core.Larkc VM arguments: -Xmx512m

Run SPARQL client
In windows:
Double-click SPARQLClient.jar
In Linux:
java –jar SPARQLClient.jar

Run example query
Execute query in SPARQL Client
Walk-through the output of the program
Go through the plug-ins’ .java files

Other interesting queries
PREFIX cyc: <http://www.cycfoundation.org/concepts/>
SELECT ?company WHERE
{ ?company cyc:mentionedInArticle "http://shodan.ijs.si:8080/GateServer/news.txt" .
?company cyc:isa cyc:PubliclyHeldCorporation }
?company cyc:isa cyc:SoftwareVendor }
{ ?company cyc:mentionedInArticle "http://shodan.ijs.si:8080/GateServer/news2.txt" .
?company cyc:isa cyc:SoftwareVendor }
?company cyc:mentionedInArticle "http://shodan.ijs.si:8080/GateServer/news2.txt" .
?company cyc:isa cyc:Business }

Other interesting queries
?company cyc:makesProductType cyc:CellularTelephone }
?company cyc:makesProductType cyc:CellularTelephone .
?company cyc:stockTickerSymbol ?ticker }
?program cyc:programAuthor ?company }
?competitor cyc:competitors ?company .
?competitor cyc:makesProductType cyc:CellularTelephone }

Plug-in SAWSDL description
<wsdl:description>

<wsdl:interface name="identifier"
sawsdl:modelReference="http://larkc.eu/plugin#Identifier">
</wsdl:interface>
<wsdl:binding name="larkcbinding" type="http://larkc.eu/wsdl-binding" />

<wsdl:service
name="urn:eu.larkc.plugin.identify.article.ArticleIdentifier"
interface="identifier”
sawsdl:modelReference="http://larkc.eu/plugin#ArticleIdentifier" >
<wsdl:endpoint
location="java:eu.larkc.plugin.identify.article.ArticleIdentifier" />
</wsdl:service>
</wsdl:description>

Plug-in ontology
@prefix larkc: <http://larkc.eu/plugin#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
larkc:ArticleIdentifier
rdf:type rdfs:Class ;
rdfs:subClassOf larkc:Identifier ;
larkc:hasInputType larkc:SPARQLQuery ;
larkc:hasOutputType larkc:NaturalLanguageDocument .

Scripted decider
Pipeline pipeline = new Pipeline();
pipeline.addPlugIn( new URIImpl( "urn:eu.larkc.plugin.identify.article.ArticleIdentifier" ));
pipeline.addPlugIn( new URIImpl( "urn:eu.larkc.plugin.transform.gate.GateTransformer" ));
pipeline.addPlugIn( new URIImpl( "urn:eu.larkc.plugin.select.cycselecter.CycSelecter" ));
pipeline.addPlugIn( new URIImpl( "urn:eu.larkc.plugin.reason.cycreasoner.CycReasoner" ));
try {
pipeline.start(theQuery);
} catch (Exception e) {
// error
}
return (VariableBinding)pipeline.take();

Write a new plug-in
Create new project
New Folder
Link bin directory
Make source directory
Add libraries
Prepare code:
Copy-paste GateTransformer.Java
Rename it to SimpleNamedEntitiyExtractor
Insert code available in SimpleNamedEntitiyExtractor.txt
Prepare/update meta-data files
SimpleNamedEntitiyExtractor.wsdl
SimpleNamedEntitiyExtractor.rdf
Update CycGateDecider
Clean, Build and Run!

LarKC Tutorial at ISWC 2009 - Second Hands-on Scenario

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