Searching Semantic Web Objects Based on Class Hierarchies
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Searching Semantic Web Objects Based on Class Hierarchies

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Presentation given at LDOW2008. It describes Falcons Object Search, a keyword-based search engine for objects on the Semantic Web.

Presentation given at LDOW2008. It describes Falcons Object Search, a keyword-based search engine for objects on the Semantic Web.

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    Searching Semantic Web Objects Based on Class Hierarchies Searching Semantic Web Objects Based on Class Hierarchies Presentation Transcript

    • Searching Semantic Web Objects Based on Class Hierarchies Gong Cheng , Weiyi Ge, Honghan Wu, Yuzhong Qu Institute of Web Science, School of Computer Science and Engineering Southeast University, Nanjing, China Presentation at the WWW 2008 Workshop: Linked Data on the Web (LDOW2008) http://iws.seu.edu.cn/services/falcons/
    • Information Islands vs. Web of Data
    • Information Islands vs. Web of Data
    • Information Islands vs. Web of Data
    • Motivation
      • How to find URIs?
      • Linked Open Data brings …
      • Single-point retrieval system
    • Demo
      • http://iws.seu.edu.cn/services/falcons/
    • Demo
    • Demo
    • Demo
    • Navigating Class Hierarchies for Query Restriction Filtering results Recommending subclasses
    • Combined Inverted Index
      • Query: <terms, classes>
    • Provenance of Typing Information
      • H euristics
        • Dereference document
        • Namespace document
        • Documents on the same host
        • Other documents
    • Class-inclusion Reasoning
    • Class-inclusion Reasoning (cont.)
      • Which axioms would be accepted by the reasoning engine?
        • The authorized description of a vocabulary is allowed to reuse the classes from other vocabularies but CANNOT further constrain their meaning.
      Class-inclusion Reasoning (cont.)
    • Recommending Subclasses
      • If a subclass covers more results, it will be more likely to be recommended.
      • Algorithm
        • Iterate over the first 1,000 results to collect classes.
        • Rank classes.
        • Select top K classes, s.t.:
          • Each selected class must be a strict subclass of a current class.
          • The class inclusion relation does NOT hold between any pair of the selected classes.
    • Example
      • K = 2
      × × × Current class √ √
    • Summarizing SW Objects
      • Expanding textual description of SW objects
      Mapping Terms to SW Objects
    • Thank You
      • Welcome to Nanjing!
    •  
    • Architecture
    • RDF Sentence
    • Crawler
      • Seed document URLs
        • PTSW, DBpedia …
        • Swoogle, Google …
      • Parse RDF documents and dereference all the mentioned URIs.