Session 2: Natural Language I.
Damaris M. Ayuso · 1990
The first paper, by L. Schubert and C. Hwang, concentrated on compositionally defining the mapping between a sentence and an appropriate meaning representation that takes tense and aspect into account. In order to derive non-indexical formulae from indexical ones as a function of context, they make use of a novel type of context component, a tense tree which evolves throughout the discourse. Occurrences of tense-aspect operators are represented as tree branches corresponding to episode (event) relationships. An interesting feature of these trees is that one can read off the tree the relationships implicit in the tense-aspect operators and surface ordering of sentences.