Indexes all coreference chains in a document using a unique id per chain These do not include singleton clusters
Fetches the coreference chain for this mention; None for singletons
Fetches the coreference chain for the mention with this sentence and head indices; None for singletons
All recognized chains, without singletons
Fetches the mention with this sentence and head indices
All mentions in this document
Indexes all mentions in a document by sentence index (starting at 0) and head index (starting at 0) This means we store only one mention per head (unlike CoreNLP which may have multiple) In case a specific processor maintains multiple mentions with same head, we keep the longest
Stores all the coreference chains extracted in one document