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

Figure 1: Screenshot showing OCR-read text in the preprocessing interface
heading. Another common cause of sentences being incorrectly marked as headings
is missing end punctuation, a not uncommon OCR error with some fonts.
For each paragraph, a number of buttons provide the most common correction
choices: deleting one or more paragraphs, linking paragraphs, editing within a
paragraph, adding missing punctuation, marking a paragraph as a title or marking
a presumed title as a paragraph. The [Show] button causes the scanned image of
the text to appear on the interface; this is useful when it is necessary to check the
original.
Unknown words are marked in boldface and shaded with a yellow background
in the text, making them easy for the annotator to spot. In figure 1 this is the case
with the string plasert, an archaic spelling of plassert ‘placed’.
All unknown words are not only highlighted in the text, but are also presented
in an alphabetical list, as shown at the top of figure 2. There is also a list of extracted
uncertain (suspicious) words, e.g. the numeral 10, which is sometimes produced by
the OCR software instead of the intended word lo ‘laughed’. The lists of unknown
and uncertain words will shrink when the initial text cleanup is done, so that they
only display words that need to be further categorized.
3.2 Categorizing unknown words
Foreign words, named entities, productive compounds, multiword expressions, neologisms,
misspellings and variant spellings are examples of the types of words that
may not be recognized automatically in the initial preprocessing phase and that need
to be categorized. The interface for this processing step is shown in figure 2, where
the selection of the string Bergom has opened the Store as window, in which the
annotator can make appropriate choices to correct the word or add it to the lexicon.
Each occurrence of a chosen word in the text is shown with its immediate context
in the Context(s) window. In the case of the string Bergom, the contexts make it