ACE 2007 Annotation Tasks
There are two distinct annotation tasks for the 2007 ACE effort.
Entities
Entity tagging the core annotation task, providing the foundation for all remaining tasks. The current ACE task identifies seven types of entities: Person, Organization, Location, Facility, Weapon, Vehicle and Geo-Political Entity (GPEs). Each type is further divided into subtypes (for instance, Person subtypes include Individual, Group and Indefinite). Annotators tag all mentions of each entity within a document, whether named, nominal or pronominal. For every mention, the annotator identifies the maximal extent of the string that represents the entity and labels the head of each mention. Nested mentions are also captured. Each entity is classified according to its type and subtype. Each entity mention is further tagged according to its class â specific, generic, attributive, negatively quantified or underspecified. Annotators also review the entire document to group mentions of the same entity together; they also label cases of metonymy, where the name of one entity is used to refer to another entity (or entities) related to it.
Timex2 extents and normalization
Timex2 extents are annotated and all timex2 mentions are normalized