Inhalt

•  
   Introduction
•  
   Problem Definition
•  
   Contribution
•  
   Outline of the Thesis
•  
  Foundations
•  
   Modeling
•  
   Ontologies
•  
   Semantic Web
•  
   RDF and RDFS
•  
   SPARQL
•  
   GLUE Information Model
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   Peer-2-Peer Networks and DHTs
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   Chord
•  
   Pastry
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   Common API for DHTs
•  
   Subgraph Isomorphism
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   Bloom Filters
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   Summary
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  Resource Matching
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   Resource Matching in the Grid
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  Modeling Resources with RDFS
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   Resource Description
•  
   Example
•  
   Integrating Background Knowledge
•  
   Classifying Properties
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   Static and Dynamic Data
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   Origin of the Information
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   More Semantics
•  
  Data Organization
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   Peer-2-Peer
•  
   Design Choices
•  
   Summary
•  
  P2P based RDF Reasoning and Querying
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   Architectural Overview
•  
   The RDF Query Problem
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   Formal Problem Definition
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   Complexity of the RDF Query Problem
•  
   Further Elements of SPARQL Queries
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   Knowledge Distribution
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   Life Cycle of Triples
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   Node Departure
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   Node Arrival
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   Accessing the Knowledge
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   Blank Node Labels
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   RDFS Rules
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   Query Evaluation
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   Goals of the Query Evaluation Strategy
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  Exhaustive Query Evaluation
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   Determination of Candidate Sets
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   Look Ahead
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   Bloom Filters
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   Optimization for rdf:type
•  
   Final Evaluation
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   Top k Query Processing
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   Introductory Example
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   The Algorithm
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   Caching and Look Ahead
•  
   Ordering of the Query Triples
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   Summary
•  
  Experimental Evaluation
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   Prototype Architecture
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  Experimental Setup and Test Data
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   Setup of the Experiments
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   Generation of Test Data
•  
   Overall Performance
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  Exhaustive Evaluation
•  
   Simulation Results
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   Test Runs
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   Single Query Scenario
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   Performance Factors During Exhaustive Evaluation
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   Influence of Bloom Filter Parameters
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   Load Balancing Issues
•  
  Top k Evaluation
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   Performance Compared to Exhaustive
•  
   Parameter Choice for Look Ahead
•  
   Triple Dissemination and Reasoning
•  
   Summary
•  
  Related Work
•  
   Grid Computing
•  
   Semantic Web and Semantic Grid
•  
   Resource Description Framework
•  
   Web Ontology Language
•  
   Semantic Grid
•  
   Semantic Grid and Services
•  
   Relational Databases
•  
   Peer-2-Peer
•  
   P2P Data Integration
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   Semantic Query Routing
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   RDF based P2P Systems
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   Edutella
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   Bibster
•  
   Summary
•  
  Conclusion
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   Applications of P2P based RDF Querying and Reasoning
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   Limitations of our Approach and Further Work
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   Summary
•  
   List of Figures
•  
   Bibliography