Dear Edmund, Here Allen's home page. See selected papers on Temporal Reasoning: http://www.cs.rochester.edu/u/james/
The following two publications from our group deal with the issue of querying such intervals, introducing indeterminacy. This is mandatory for a consistent handling of historical temporal references. The question: "what happened 43 BC" can strictly not be answered. The question that can be answered is either "which events may have happened within 43 BC" (or slightly before or after), and "which events must have happened within 43 BC". http://www.ics.forth.gr/proj/isst/Publications/paperlink/implementing_a_temporal_datatype.ps.gz http://www.vldb.org/conf/2000/P441.pdf We have implemented this logic for the database of the Greek Archive of Monuments to the satisfaction of the archeologists and historians there. I think CHIN, the City of Geneva, and SSL have implemented an equivalent logic. The paper: B. Nebel, H.-J. BĪrckert, Reasoning about Temporal Relations: A Maximal Tractable Subclass of Allen's Interval Algebra, Journal of the ACM, 42(1): 43-66, 1995. (ftp://ftp.informatik.uni-freiburg.de/documents/papers/ki/nebel-burckert-jacm95.ps.gz) proves, that only the relationships we have selected are tractable. This is important, because it means that you can implement it in a database search engine. best, Martin >Hello Martin, > >I have been interested to see your comments on CRM spatio temporal >relationships. Could you please provide me >with the full reference for >Allens 1983 work that you refer to? I would like to follow this up in more >detail. > >Thank you > >Best wishes > >Edmund Lee >English Heritage Data Services Unit > > -----Original Message----- > From: martin [mailto:[email protected]] > Sent: Tuesday, January 29, 2002 7:45 PM > To: [email protected] > Subject: [crm-sig] Issue 4, scope notes > > Dear All, > > In Paris we decided to add to the E2 Temporal Entity the well-known > temporal relationships from > J.F.Allen, 1983, which can be fairly regarded as a standard in Knowledge > Representation. > I terms of directed, bidirectional properties as we use in the CIDOC CRM, > they can be defined as: > -- -------------------------------------------------------------- Dr. Martin Doerr | Vox:+30(810)391625 | Principle Researcher | Fax:+30(810)391609 | Project Leader SIS | Email: [email protected] | | Information Systems Laboratory | Institute of Computer Science | Foundation for Research and Technology - Hellas (FORTH) | | Vassilika Vouton,P.O.Box1385,GR71110 Heraklion,Crete,Greece | | Web-site: http://www.ics.forth.gr/proj/isst | --------------------------------------------------------------
