wiki:ast

Version 1 (modified by xmedved1, 3 years ago) (diff)

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Automatic Semantic Tool (AST)

Full semantic analysis of natural language (NL) texts is an open problem. The most comprehensive semantic systems build upon a mathematically sound formalism of a selected logical system. Mostly due to computability and efficiency, current systems work with the first order logic (or its variant). However, the low-order logic is not appropriate for capturing higher-order phenomena that occurs in natural language, such as belief attitudes, direct speech, or verb tenses. In our project, we develop new tool for automatic semantic analysis (AST) that emerged from (a module of) the Czech syntactic parser SYNT .

AST is now a standalone tool based on Transparent Intensional Logic (TIL). It works with the same input files (lexicons, semantic rules, ...) that were designed and developed in SYNT.

AST can provide a semantic analysis in the form of Transparent Intensional Logic (TIL) constructions independently on the input syntactic parser and language.

Adaptation for new language consists in a specification of four lexicon files that describe lexical items, verb valencies, prepositional valencies and a semantic grammar.

Input

To create a semantic structure of a sentence, AST needs the output from previous analysis. A usual output is in the form of a syntactic tree