LarKC Tutorial at ISWC 2009 - First Hands-on Scenario

LarKC Early Adopters Hands-on Florian Fischer STI Innsbruck

Introduction
Purpose:
Show how a workflow of plug-ins fits together and interacts
Show wrapping an existing reasoner (IRIS) (later)
Demonstrate anytime behaviour
Rule-based reasoning in LarKC
Setup an eclipse project with prototype plug-ins
Execute some queries
Change the statements to be reasoned with
Modify reasoning
18/05/2009

Getting Started
Required software
Java JDK 1.6
Eclipse
Import LarKC eclipse projects
File menu -> Import
Choose general -> existing projects in to workspace
Platform
ISWCDemo
18/05/2009

Execute a query
Step 1: In the project ISWCDemo' run the class:
Run ISWCDemo with the first settings
set max heap size: -Xmx1024m
If you have an internet connection, then you should see several iterations of pipeline output
Plug-ins used:
SPARQL to triple pattern query transformer
Sindice identifier
Growing data selecter
IRIS reasoner plug-in (with no rules)
18/05/2009

Different Data
Step 2: Switch to some local data
Based on http://dev.isb-sib.ch/projects/uniprot-rdf/
Use the SimpleFileReaderIdentifier to read in local Uniprot data-sets
Use the IRIS reasoner plug-in, but without any rules yet
More on the inner workings of the IRIS plug-in later
Execute a query to get all triples
Two iterations of workflow
~9800 triples
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Change Inference Rules
Step 3: Switch on inference
RDF, L2 (custom ruleset) or RDFS
Output: More triples (~ 28000 for RDFS)
Step 4: Look for sub-classes of ' pathway 402'
No inference: ~50 sub-classes
Step 5: Look for sub-classes of ' pathway 402'
With inference (RDFS): 238 sub-classes
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Create Inference Rule
Step 6: Sub-classes of self
Output (any entailment): Nothing!
Why?
Look for ':Class' in core.owl
Step 7: Fix
Copy L2_entailment.rules to L2_plus.rules
Add the following statement:
triple(_iri("owl:Class"),_iri("rdfs:subClassOf"),
_iri("rdfs:Class")) :- .
Rerun!
18/05/2009

Summary
You have:
Seen a handful of LarKC plug-ins
Used them together in a simple workflow
Swapped plug-ins
Experimented with a plug-in
18/05/2009

LarKC Tutorial at ISWC 2009 - First Hands-on Scenario

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