In the chunked representation, base-level constituent boundaries and labels are present, but there are no dependencies between constituents, as shown by the following sample sentence: Our chunks were derived from the treebank trees using the conversion described by Tjong Kim Sang and Buchholz (2000).
the experiments were carried out using Table 13 Accuracy of semantic-role prediction for unknown boundaries (the system must identify the correct constituents as arguments and give them the correct roles).