Semantic Navigator: Use of Semantic Data in Web Navigation Jan - PowerPoint PPT Presentation

Semantic Navigator: Use of Semantic Data in Web Navigation Jan Michelfeit, Tomáš Knap michelfeit.jan@gmail.com Faculty of Mathematics and Physics Charles University, Prague Czech Republic

emantic Navigator  Tool for navigation on the web of documents  Mozilla Firefox extension  Supports a familiar paradigm of searching for information in web documents  Solves some of the issues with traditional web search using a Semantic Web search engine Charles University in Prague 2

Problems with traditional web search  Search term ambiguity The film "Casino"? A Las Vegas Casino? Online Casino?  No support for search of property values Search for "Casino release year"? "Casino produced"? " Casino released "? "Casino opening weekend"? 3

Problems with browsing LD  Ordinary users are not used to it  Extra effort to validate provenance  Estabilishing trust to the data source http://www.w3.org/TR/rdf-primer/ 4

We‘ve got a solution  Use semantic data for web search  Suggest properties from ontologies  Provide quick access the search without leaving your browser  Adhere to the traditional paradigm locate documents – find information manually 5

Goals of Semantic Navigator  Make web navigation easier in discovering  more information about a selected entity  more information about its properties  Take advantage of technologies such as RDF(a), microformats or ontologies  Bring advantages of the Semantic Web search to ordinary users  Be versatile, not domain specific 6

How to use it Highlight resources What you search for Search results Charles University in Prague 7

An Example  Navigate to www.wikier.org 1  Presence of RDFa is detected 1 Homepage of Sergio Fernández, used with his kind permission 8

An Example  Highlight semantic data with Semantic Navigator 9

An Example  We want to know more about people that Sergio knows → Click on the resource and select foaf:knows in the menu 10

An Example  We want to know more about people that Sergio knows → Click on the resource and select foaf:knows in the menu 11

An Example  Get suggested people, search for more documents about them 12

More examples  semantic-navigator-screencast.avi 13

Internals  Mozilla Firefox extension  Uses a Java component (Any23, Jena libraries)  Gets search results from Sindice  Provides suggestions for triple subjects/objects retrieved from Sindice SPARQL endpoint  Provides direct access to summaries on Sig.ma 14

Internals architecture outline 15

Internals step by step 1) Detect semantic data RDFa, microformats, RDF documents linked by a <link> element • 2) Extract data and create an RDF graph 3) Optionally import used ontologies (cached) 4) Optionally highlight data in the web page  includes detection of literal occurences in non-annotated text 5) The users selects what she is interested in 6) Display search results retrieved from Sindice 16

Future work what we can improve  Usability for non-technical users  Drop dependency on Java  Deal with insufficient identifier sharing  Filter by xml:lang for literals  More sophisticated search - use IFPs, owl:sameAs links, search by blank nodes  Filtering and suggestions of properties while typing  Searching for a manually entered keyword 17

Future work What the world can do for us  Publish data in RDFa, microformats etc.  or link to an RDF alternative from HTML  Share identifiers, use owl:sameAs links  Continue the great work on Semantic Web search engines 18

Possible future applications  More general alternative to domain-specific solutions  Effortless Wikipedia-like Navigation 19

Thank you for your attention Jan Michelfeit, Tomáš Knap michelfeit.jan@gmail.com Faculty of Mathematics and Physics Charles University, Prague Czech Republic