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SWARMS: A Tool for Domain Exploration in Semantic Web and its

Application in FOAF Domain

Bangyong Liang,Jie Tang,Juanzi Li,

Kehong WangDept. of Computer Science, Tsinghu

a Univ.

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Domain Exploration Tool

Semantic Web is made up of domain specific data

Some problems still exist Visualization and Navigation Mining Index-based Search Association Search

SWARMS provides an easy way to explore domain data

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Design Goal

Easy to migrate among domains Sourceforge, http://www.sourceforge.net XinhuaML, Chinese News Domain FOAF, Friend-of-a-Friend

Manage large-scale domain specific data Index-based search, based on Lucene Database backend storage

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Current Implementation

Backend Storage Database + Jena

Index-based Search Lucene + Database

Visualization and Navigation JUNG based Layout and renderer

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System Components

PNSDB

Jena basedFOAF API

FOAFOntologyrepository

Lucene

IndexRepository

Index-basedSearch

JUNG basedVisualization

Association Search

User interface

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Index-based Search

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Context Visualization

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Paper Cluster Visualization

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Friend Cluster Visualization

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Person View

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Paper View

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Association View

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Data Size

Current Ontological Data Size >400,000 persons and their publications foaf:knows, foaf:publications, foaf:topic, foaf:maker jena_g1t1_stmt > 3,000,000 records

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Performance Analysis

Index Performance

Performance for fetching one instance’s context 20 instances with differen

t number of propterties are evaluated

Keyword Number of Results

Time(seconds)

Li 921 0.11(s)

Zhang 759 0.11(s)

James 545 0.09(s)

Liang 180 0.09(s)

Tim 156 0.09(s)

Baul 0 0.09(s)

Max(s) Min(s) Average(s)

0.02 0.01 0.014