Introducing features of natural language into query languages for databases increases their power and ergonomics. Therefore, theories are needed which formalise these features of natural language. Focusing on indeterminateness we discuss some existing theories, especially fuzzy logics and Dempster-Shafer-Theory, in order to develop a paradigm which allows for a direct comparison of different theories with respect to their formalisation of some central aspects of natural language. Key Words: Database Queries, Natural Language, Indeterminateness INTRODUCTION In the area of database applications, a tendency to improve query languages by introducing features of natural language such as vague concepts can be recognised (e.g. [1]). The notions of truth, possibility, indeterminateness, probability, and ignorance are further important concepts of natural language and human thinking (cf. [2], [3]). Many different theories have been developed for their formalisation (e.g. [3] to [8]). However...