Categorization of Adjuncts

Once the nuclei are identified, we can easily find out the adjuncts. They correspond to all the other elements which appear in the context. There are two kinds of adjuncts: the left and the right adjuncts. The contexts used are:

[ _ NU ]	for the left adjuncts
[ Al* NU _ ]	for the right adjuncts

If an element appears in place of the underscore, and is not already categorized as nucleus, then it is categorized as adjunct. Once the left adjuncts are found out, they can be used for the categorization of the right adjuncts. They thus appear in the context as optional elements (this is helpful to capture circumpositions).

Since the Adjectival Phrase occurring inside an NP is not marked in the Penn treebank, we introduce the class of adjunct of adjunct. The contexts used to find out the adjuncts of the left adjunct are:

[ _ Al NU ]	for the left adjuncts of Al
[ al* Al _ NU ]	for the right adjuncts of Al

The contexts are similar for adjuncts of right adjuncts.