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The Directionality Constraint

We have reduced the amount of phrase structure to a minimum. Therefore we must rely on word order constraints to ensure that all and only grammatical word orders are derivable. The treatment of word-order starts out with the directionality constraint. Heads may specify for a given complement whether it has to precede or follow the head. For this purpose, a feature DIR is introduced, with ` $ \leftarrow$' and ` $ \rightarrow$' as possible values. The interpretation of this feature is given by the following word order constraint:

{\bf Directionality Constraint:} All elements left of the head ha...
...~~$<$\ ~~
\begin{displaymath}dir & $\leftarrow$\ \end{displaymath}

The position of a complement with respect to its head can now be specified lexically, by simply adding the appropriate specifications on the COMPS-list of the head. Thus, the lexical entry for e.g. `wollen' is extended as follows:

{\rm wollen} ({\em to want}) $\mapsto$ \begin{displa...
dir & $\rightarrow$\ \end{displaymath}}

Noord G.J.M. van