Working with events and states in PENG light

Rolf Schwitter*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


In this paper I discuss how the controlled natural language PENG Light can be modified so that it can serve as a high-level interface language to the Event Calculus. The Event Calculus is a narrative-based formal language for reasoning about events, their effects and timepoints, and can be used for various reasoning tasks where a representation of time is important. Using a scenario from a dynamic domain, I show what kind of modifications are necessary on the level of the controlled natural language to specify the background knowledge that is required to deal with direct and indirect effects of events and with continuous change in that domain. I discuss how the output of the controlled natural language processor of PENG Light that distinguishes between events and states can be aligned with the input language of the Event Calculus, and then be used for automated reasoning. Finally, I show how the Event Calculus can be used to support the question answering process and then evaluate its reasoning capabilities using a number of benchmark questions stated in controlled natural language.

Original languageEnglish
Title of host publicationControlled Natural Language - Second International Workshop, CNL 2010, Revised Papers
EditorsMichael Rosner, Norbert E. Fuchs
Place of PublicationMarettimo Island, Italy
PublisherSpringer, Springer Nature
Number of pages21
Volume7175 LNAI
ISBN (Print)9783642311741
Publication statusPublished - 2012
Event2nd Workshop on Controlled Natural Language, CNL 2010 - Marettimo Island, Italy
Duration: 13 Sept 201015 Sept 2010

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7175 LNAI
ISSN (Print)03029743
ISSN (Electronic)16113349


Other2nd Workshop on Controlled Natural Language, CNL 2010
CityMarettimo Island


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