The monolingual components of the formalism thus consist of unification grammars, similar to PATR. Unlike PATR the terminal elements in the formalism are not defined in the lexicon, but orthographical, inflectional and morphological rules define the relation between the terminals and a lexicon of stems and affixes. For example, the word `eaters' is analyzed into [eat,er,s] by the orthographical component. For the orthographical component we use a reversible two-level system . Reversible inflectional rules relate to a list of stems and affixes with the feature structure . Inflection is defined by a formalism comparable to the paradigmatic approach of . Morphological analysis is based on a separate reversible unification grammar in which derivational processes and compounding can be defined . For example, could be analysed as . Note that the separation of inflectional rules and compound/derivation rules implements a type of `level' theory defended by e.g. .