In order to clarify how the strategy works we consider the attachment example of section 5.5 again. Suppose that for the sentence
the parser has determined the derivation trees in figure 5.8 with corresponding (simplified) semantic representations:
for the left and
for the right tree. For the first reading the paraphrase
is generated in the same way described in section 5.5. In this case the left tree of figure 5.8 is marked by means of the right one.
In order to yield a paraphrase for the second reading, the right derivation tree of figure 5.8 is marked by means of the left one. In this case markers are placed in the right tree at the nodes named `pp_mod' and `gesehen'. If the grammar allows to realize `mit(frau, fernglas)' using a relative clause then the paraphrase
is generated. Otherwise, the markers are pushed up successively to the root node `topic' of that tree yielding the paraphrase:
Now, the produced paraphrases are given to the user who has to choose the appropriate one. In the current implementation this is simply done by entering the corresponding number of the selected paraphrase.