Entity recognition

The goal of this task is to identify all the entities in a document and their types. These entities are all the relevant terms (single word or multiple words) that represent semantically important elements in a sentence. Entities always consist of one or more complete words (i.e., not a prefix or a suffix of a word), and never include any surrounding punctuation symbols, parenthesis, etc.

Four types of entities are considered:

• Concept: identifies a relevant term, concept, idea, in the knowledge domain of the sentence.
• Action: identifies a process or modification of other entities. It can be indicated by a verb or verbal construction, and also by nouns.
• Predicate: identifies a function or filter of another set of elements, which has a semantic label in the text, and is applied to an entity with some additional arguments.
• Reference: identifies a textual element that refers to an entity of the same sentence or of different one.