DC Proposal: Graphical Models and Probabilistic Reasoning for Generating Linked Data from Tables

  • Varish Mulwad
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7032)


Vast amounts of information is encoded in tables found in documents, on the Web, and in spreadsheets or databases. Integrating or searching over this information benefits from understanding its intended meaning and making it explicit in a semantic representation language like RDF. Most current approaches to generating Semantic Web representations from tables requires human input to create schemas and often results in graphs that do not follow best practices for linked data. Evidence for a table’s meaning can be found in its column headers, cell values, implicit relations between columns, caption and surrounding text but also requires general and domain-specific background knowledge. We describe techniques grounded in graphical models and probabilistic reasoning to infer meaning associated with a table. Using background knowledge from the Linked Open Data cloud, we jointly infer the semantics of column headers, table cell values (e.g., strings and numbers) and relations between columns and represent the inferred meaning as graph of RDF triples. A table’s meaning is thus captured by mapping columns to classes in an appropriate ontology, linking cell values to literal constants, implied measurements, or entities in the linked data cloud (existing or new) and discovering or and identifying relations between columns.


Linked Data Tables Entity Linking Machine Learning Graphical Models 


  1. 1.
    Bizer, C., Lehmann, J., Kobilarov, G., Auer, S., Becker, C., Cyganiak, R., Hellmann, S.: Dbpedia - a crystallization point for the web of data. Journal of Web Semantics 7(3), 154–165 (2009)CrossRefGoogle Scholar
  2. 2.
    Cafarella, M.J., Halevy, A.Y., Wang, Z.D., Wu, E., Zhang, Y.: Webtables: exploring the power of tables on the web. PVLDB 1(1), 538–549 (2008)Google Scholar
  3. 3.
    Ding, L., DiFranzo, D., Graves, A., Michaelis, J.R., Li, X., McGuinness, D.L., Hendler, J.A.: Twc data-gov corpus: incrementally generating linked government data from In: Proc 19th Int. Conf. on the World Wide Web, pp. 1383–1386. ACM, New York (2010)CrossRefGoogle Scholar
  4. 4.
    Han, L., Finin, T., McNamee, P., Joshi, A., Yesha, Y.: Improved pmi utility on word similarity using estimates of word polysemy. TKDE (2011) (under review)Google Scholar
  5. 5.
    Han, L., Finin, T., Parr, C., Sachs, J., Joshi, A.: RDF123: From Spreadsheets to RDF. In: Sheth, A.P., Staab, S., Dean, M., Paolucci, M., Maynard, D., Finin, T., Thirunarayan, K. (eds.) ISWC 2008. LNCS, vol. 5318, pp. 451–466. Springer, Heidelberg (2008)CrossRefGoogle Scholar
  6. 6.
    Koller, D., Friedman, N.: Probabilistic Graphical Models: Principles and Techniques. MIT Press (2009)Google Scholar
  7. 7.
    Langegger, A., Wöß, W.: XLWrap – Querying and Integrating Arbitrary Spreadsheets with SPARQL. In: Bernstein, A., Karger, D.R., Heath, T., Feigenbaum, L., Maynard, D., Motta, E., Thirunarayan, K. (eds.) ISWC 2009. LNCS, vol. 5823, pp. 359–374. Springer, Heidelberg (2009)CrossRefGoogle Scholar
  8. 8.
    Limaye, G., Sarawagi, S., Chakrabarti, S.: Annotating and searching web tables using entities, types and relationships. In: Proc. 36th Int. Conf. on Very Large Databases (2010)Google Scholar
  9. 9.
    Manning, C.D., Raghavan, P., Schütze, H.: Introduction to Information Retrieval, 1st edn. Cambridge University Press (July 2008)Google Scholar
  10. 10.
    Mulwad, V., Finin, T., Syed, Z., Joshi, A.: T2LD: Interpreting and Representing Tables as Linked Data. In: Proc. Poster and Demonstration Session at the 9th Int. Semantic Web Conf. (November 2010)Google Scholar
  11. 11.
    Mulwad, V., Finin, T., Syed, Z., Joshi, A.: Using linked data to interpret tables. In: Proc. 1st Int. Workshop on Consuming Linked Data, Shanghai (2010)Google Scholar
  12. 12.
    Polfliet, S., Ichise, R.: Automated mapping generation for converting databases into linked data. In: Proc. 9th Int. Semantic Web Conf. (November 2010)Google Scholar
  13. 13.
    Resnik, P.: Semantic similarity in a taxonomy: An information-based measure and its application to problems of ambiguity in natural language. Journal of Artificial Intelligence Research 11(1), 95–130 (1999)zbMATHGoogle Scholar
  14. 14.
    Sackett, D., Rosenberg, W., Gray, J., Haynes, R., Richardson, W.: Evidence based medicine: what it is and what it isn’t. Bmj 312(7023), 71 (1996)CrossRefGoogle Scholar
  15. 15.
    Sahoo, S.S., Halb, W., Hellmann, S., Idehen, K., Thibodeau Jr., T., Auer, S., Sequeda, J., Ezzat, A.: A survey of current approaches for mapping of relational databases to rdf. Tech. rep., W3C (2009)Google Scholar
  16. 16.
    Salton, G., Mcgill, M.J.: Introduction to Modern Information Retrieval. McGraw-Hill, Inc., New York (1986)zbMATHGoogle Scholar
  17. 17.
    Syed, Z., Finin, T.: Creating and Exploiting a Hybrid Knowledge Base for Linked Data. Springer, Heidelberg (April 2011)CrossRefGoogle Scholar
  18. 18.
    Syed, Z., Finin, T., Mulwad, V., Joshi, A.: Exploiting a Web of Semantic Data for Interpreting Tables. In: Proc. 2nd Web Science Conf. (April 2010)Google Scholar
  19. 19.
    Vavliakis, K.N., Grollios, T.K., Mitkas, P.A.: Rdote - transforming relational databases into semantic web data. In: Proc. 9th Int. Semantic Web Conf. (2010)Google Scholar
  20. 20.
    Venetis, P., Halevy, A., Madhavan, J., Pasca, M., Shen, W., Wu, F., Miao, G., Wu, C.: Recovering semantics of tables on the web. In: Proc. 37th Int. Conf. on Very Large Databases (2011)Google Scholar
  21. 21.
    Wang, J., Shao, B., Wang, H., Zhu, K.Q.: Understanding tables on the web. Tech. rep., Microsoft Research Asia (2011)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Varish Mulwad
    • 1
  1. 1.Computer Science and Electrical EngineeringUniversity of MarylandUSA

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