Next, each cluster is processed by NEXUS, the core event extraction engine, which initially performs shallow linguistic analysis, including, i.a., fine-grained tokenization, sentence splitting, domain-specific dictionary look-up (e.g., for the detection of numerical expressions, quantifiers, person titles, and for the labeling of key terms indicating unnamed person groups), and morphological analysis.
for morphological analysis an extended version of the full-form MUL-TEXT 3 lexica are used.