This thesis discusses the *English Language Semantic Analyser* (ELSA), a Natural Language Processing system for automatic semantic analysis of English texts. This system was developed in the research project *Principle-Based Parsing of Chemical Texts* at the Department of Language & Speech of the University of Nijmegen. The research was part of a project carried out in co-operation with the Department of Analytical Chemistry, also of the University of Nijmegen. The central goal was to create a chemical Information Extraction System, a system for automatic extraction of chemically relevant information from descriptions (title and abstracts) of English texts on chemical processes, taken from *Analytical Abstracts*.
The extracted information is to be stored in a knowledge base and can be used in, for example, an expert system. ELSA is based on principles of Government & Binding theory.
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