A Treebank-based Investigation of IPP-triggering Verbs in Dutch

processing. The Add word function allows the annotator to type in words that the
system has missed and add them to the list of unknown words. The same functionality
for adding words to the morphological component has also been implemented
in the disambiguation interface, so that when an error like this is discovered after
parsing, it may be added to the morphology in the same way and treated correctly
in a reparse of the sentence.
3.3 Assigning lexical properties to unknown words
If an unrecognized word must be added to the lexicon, the annotator has to decide
whether it is a new word, to be added to the morphology as a new paradigm,
or a variant form of an existing paradigm. Entering new noninflecting words is a
straightforward process involving simply choosing the correct word category, such
as interjection, place name, masculine first name, feminine first name, etc.
Words belonging to the open, productive word classes (nouns, verbs, adjectives
and adverbs) usually have inflectional paradigms which must be defined. The dictionary
entry form of the word is entered in the interface as the Base form, and a
similar word with the same word class and inflection pattern is specified, either by
selecting it from a drop-down list of suggestions, or by entering it into a text box.
The system proposes as candidates a number of word forms ending with the same
characters at the end of the word. When one of these candidates is chosen, the system
automatically generates the paradigm for the word being entered. In figure 3,
the new compound erkemikkelen ‘arch fool’ is being added as a paradigm inflecting
like the existing compound dåsemikkel ‘nitwit’, and the new paradigm is shown to
the right. If the annotator decides that this is the correct inflection and chooses this
paradigm, all inflected forms of the unrecognized word are automatically added to
the morphological analyzer.
Figure 3: Adding a paradigm
If the new word is a verb, it is not sufficient to add an inflectional paradigm.
Verbs must also be assigned subcategorization frames necessary for parsing. Sim-