1. 1 Complex Entity Coreference Builds on existing coreference annotation –Combining ACE and OntoNotes approaches Using ACE types plus “other” Represented as APF files This new layer adds: –Member, Subset, and Member-base relations –Classification of mention reference types Referential, ascriptive (feature), descriptive (secondary ref), negative, determined, interrogative, generic, unspecified –Mention syntactic contexts Flagging possessive and adjectival mentions Useful for applications like Social Network Analysis –Organization structure –Organizational roles (from the content of the mentions)

2. 2Member Recognizing group membership, even where not explicitly stated, should be directly usable in building SNA networks. Hall will be only the second member of Congress to travel in Iraq since the war, according to Hall's office. The last visitor was then-U.S. Rep. Bill Richardson of New Mexico, who went to help a pair of U.S. oilmen in diplomatic trouble. Member (Hall, Congress) Member (Richardson, Congress) The Iraqi government has agreed to let U.S. Rep. Tony Hall visit the country next week … The Dayton Democrat, who has traveled to other crisis points including Sierra Leone and North Korea, will spend … Member (Sierra Leone, other crisis points) Member (North Korea, other crisis points) Member-base (Iraq, other crisis points)

3. 3Subset Recognizing subset relations allows properties of the superset to be applied to the subset. He said companies engaged in e-commerce would be able to set up offices, employ staff and own equipment in the open zone, including fully-owned foreign companies. Subset (fully-owned foreign companies, companies engaged in e-commerce) In 1996 the WHO found that much of the population existed in a state of ''semi starvation.'' Subset (much of the population, the population)

4. 4 Mention Reference Types Knowing mention reference types will assist systems in modeling discourse entities. E.g. ascriptive mentions are not intended to distinguish a unique referent. Sheikh Mohamed, who is also the Defense Minister of the United Arab Emirates, announced… The last visitor was then-U.S. Rep. Bill Richardson of New Mexico The Iraqi government has agreed to let U.S. Rep. Tony Hall visit … The Dayton Democrat … will spend three days … … "we want to make Dubai a new trading center." Referential Ascriptive Descriptive Sheikh Mohamed, who is also the Defense Minister … announced at the inauguration ceremony … The minister, who has his own website, also said …