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The chapter on formats and models for lexicons deals with different available data formats of lexical resources. It elaborates on their structure and possible uses. Motivated by the restrictions in merging different lexical resources based on widely spread formalisms and international standards, a formal lexicon model for lexical resources is developed which is related to graph structures in annotations. For lexicons this model is termed the Lexicon Graph. Within this model the concepts of lexicon entries and lexical structures frequently described in the literature are formally defined and examples are given. The article addresses the problem of ambiguity in those formal terms. An implementation based on XML and XML technology such as XQuery for the defined structures is given. The relation to international standards is included as well.
Igel is a small XQuery-based web application for examining a collection of document grammars; in particular, for comparing related document grammars to get a better overview of their differences and similarities. In its initial form, Igel reads only DTDs and provides only simple lists of constructs in them (elements, attributes, notations, parameter entities). Our continuing work is aimed at making Igel provide more sophisticated and useful information about document grammars and building the application into a useful tool for the analysis (and the maintenance!) of families of related document grammars