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Searching the Semantic Web
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Introduction Research Focuses: IE Ontologies (creating, languages, merging, storing, querying) Next Sep: Using the Semantic Web How will we use pages for useful tasks? How will we build Semantic Web Services?
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Example: Traveler wants to know: Cruises in San Francisco Bay Company Name Price Location Schedule How will a Searching Service provide that information? Introduction
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Thesis Statement (revised for ppt) Take Next Logical Step In Semantic Web Build Searching Service Use Google as search engine Assume: Most (if not all) pages are annotated with OWL Primary Objects are known Service Has a Global Ontology
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Outline 1. Semantic Querying 2. Crawling 3. Indexing 4. Returning Results
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1. Semantic Querying How do you know what the user meant? How do you distinguish the subject? Extremes: SQL queries Accept anything RDF = (Subject, Predicate, Object) User provides desired subject, and objects (attributes)
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2. Crawling Google’s Googlebot does real crawling We look at results from normal Google search How to find matches on annotated pages?
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2. Crawling
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3. Indexing Index on Records Given from Crawling Ideas: Fully Filled Records First Closeness of Concept Match Measure by distance from referenced ontology mapping to user words mapping in Global Ontology
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4. Returning Results Returns Dynamic Page of Records: Name: Price: Location: Schedule: http://www.sourcepage.com Records may be ordered according to chosen attribute Angel Island Tiburon-Ferry $8.00 21 Main Street Hourly
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Contributions Enhance the ability to access information on the Web Step closer to machine understanding Building block for Semantic Web Services Past research put to use
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