Argument Coreference Resolution

Resolves references to the same real-world entity across a legal text. This includes named entities (e.g., 'Acme Corp.' and 'the Plaintiff'), nominal phrases (e.g., 'the contract' and 'the agreement dated March 1st'), and pronouns (e.g., 'it', 'they').

• Bridging Anaphora: Links a mention to a previously introduced entity that is not a direct coreferent but is contextually related (e.g., 'the court' -> 'the judge').
• Split Antecedents: Identifies when a plural pronoun refers to multiple distinct entities introduced separately (e.g., 'Smith and Jones' -> 'they').

Connects mentions that refer to the same proposition or argumentative claim rather than a physical entity. This is unique to argument mining and essential for tracking reasoning.

• Discourse Deixis: Resolves references like 'this argument,' 'that reasoning,' or 'the foregoing' to the specific prior claim they point to.
• Propositional Anaphora: Links a pronoun or noun phrase to a previously stated proposition (e.g., 'The statute is unconstitutional. This renders the contract void.').

Extends coreference resolution across multiple legal filings in a single case docket. A claim made in a complaint must be linked to its rebuttal in a motion to dismiss and its final treatment in a judicial opinion.

• Canonical Entity Mapping: Aligns different naming conventions for the same party across documents (e.g., 'Defendant' in one brief vs. 'Respondent' in another).
• Argument Threading: Tracks the evolution of a specific legal argument as it is referenced, attacked, and refined across a sequence of filings.

Handles the diverse ways the same concept is expressed in legal prose. Resolution systems must be robust to synonymy, hypernymy, and domain-specific jargon.

• Terminological Variation: Maps 'breach of contract' to 'contractual violation' and 'failure to perform.'
• Definite Descriptions: Resolves phrases like 'the aforementioned doctrine' or 'the disputed clause' to their specific antecedents using discourse context.

Identifies references that point forward in the text (cataphora) and resolves references based on document structure rather than pure linguistics.

• Cataphora: Resolves a pronoun that precedes its referent (e.g., 'Although he denied it, the defendant later admitted...').
• Structural Salience: Uses the rhetorical role of a sentence (e.g., 'Issue Presented,' 'Holding') to weight the likelihood that a mention within it is the primary antecedent for subsequent references.

Detects and resolves implicit references where the argument or entity is not explicitly mentioned but is grammatically required. Common in pro-drop languages and terse legal writing.

• Null Subject Resolution: Identifies the implied subject of a verb (e.g., 'The contract was signed. [The parties] Agreed to the terms.').
• Implicit Predicate Coreference: Links an elided verb phrase to its antecedent (e.g., 'The plaintiff filed a motion, and the defendant did [file a motion] too.').