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ISO – Semantic Roles, TC37, SC4

ISO – Semantic Roles, TC37, SC4. Martha Palmer, Harry Bunt, Nianwen Xue, Katrin Erk, Colin Baker, Karin Kipper, Volha Petukhova , James Pustejovsky ISA-6 Meeting January 12, 2011 Oxford, England. What are semantic roles?. “Who did What to Whom, and How, When and Where?”

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ISO – Semantic Roles, TC37, SC4

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  1. ISO – Semantic Roles, TC37, SC4 Martha Palmer, Harry Bunt, Nianwen Xue, Katrin Erk, Colin Baker, Karin Kipper, VolhaPetukhova, James Pustejovsky ISA-6 Meeting January 12, 2011 Oxford, England

  2. What are semantic roles? • “Who did What to Whom, and How, When and Where?” • The sun melted the ice/The ice melted. • The soprano sang an aria/The soprano sang.

  3. Desiderata for Semantic Roles • Consistently recognizable • Clarify sense distinctions • Generalizability • Learnable • Potential for inferencing

  4. ISO-SR Goal: A consensual annotation scheme for Semantic Roles • Semantic role frameworks being used to support data annotation have strong underlying compatibilities. • A loose mapping between definitions of individual semantic roles would be beneficial • English examples: • LIRICS, FrameNet, Verbnet, PropBank

  5. Objectives • Language neutral semantic representations • The promotion of interoperability through a pivot representation for mapping between • Alternative semantic role representations • Syntactic theories • Eventually different languages • Guidelines for creating immediately interoperable new resources for languages

  6. At least two applicable situations • Annotations where the SRs are statically recorded in annotated corpora; • As a dynamic structure produced by automatic systems.

  7. The associated working group • Core Editorial Group (+ students): • Martha Palmer (USA), Collin Baker (USA), Harry Bunt (Holland), Katrin Erk (USA, Germany), Karin Kipper Schuler (USA), James Pustejovsky (USA), Nianwen Xue (USA, China), VolhaPetukhova, • Expert Group (above, plus): • Kiyong Lee (South Korea), Thierry Declerck (Germany), NicolettaCalzolari (Italy), ZdenkaUroseva (the Czech Republic), Dan Flickinger (USA)

  8. Defining background concepts • Arguments/adjuncts Nianwen Xue • Semantic roles w/examples Martha Palmer • Semantic types, Martha Palmer • Entailments/Implicatures Katrin Erk • Aspect & event types James Pustejovsky • Word sense Martha Palmer

  9. Review the following frameworks • PropBank • VerbNet • FrameNet • LIRICS • SemLink, • maps individual lexical units from these frameworks as well as WordNet (1 to many)

  10. Will develop during the report writing • Guidelines for distinguishing between thematic roles • A more detailed thematic role hierarchy • Based on LIRICS • A means of mapping the resources • Similar to the sense hierarchy

  11. Thematic Role Hierarchy • PropBank Roles coarse grained distinctions • VerbNet/LIRICS roles • FrameNet Frame Elements

  12. Include Discussion of Relations between • Semantic Roles and Word Sense • Semantic roles and Semantic types (selectional preferences) • Aspectual types • Verb Class/Frame hierarchies • Complexities • Fuzzy boundaries between different roles • Etc.

  13. Next Step • Restructuring of draft report based on Harry’s feedback

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