Triple

T1620070
Position Surface form Disambiguated ID Type / Status
Subject MBTA bus route 57 E35009 entity
Predicate historicalPredecessor P97 FINISHED
Object MBTA Green Line A branch
The MBTA Green Line A branch was a former light rail line in Boston and its western suburbs that once ran between downtown and Watertown before being replaced by bus service.
 E278019 NE FINISHED

How this triple was built (4 steps)

Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.

NER Named-entity recognition gpt-5-mini
Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: MBTA Green Line A branch | Statement: [MBTA bus route 57, historicalPredecessor, MBTA Green Line A branch]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: MBTA Green Line A branch
Context triple: [MBTA bus route 57, historicalPredecessor, MBTA Green Line A branch]
  • A. MBTA Green Line B branch
    The MBTA Green Line B branch is a light rail service in Boston that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
  • B. MBTA Green Line E branch
    The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
  • C. MBTA Green Line D branch
    The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
  • D. MBTA Green Line C branch
    The MBTA Green Line C branch is a light rail service in Boston and Brookline that runs primarily along Beacon Street, connecting Cleveland Circle to downtown Boston.
  • E. MBTA Blue Line
    The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NEDg Description generation gpt-5.1
Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: MBTA Green Line A branch
Triple: [MBTA bus route 57, historicalPredecessor, MBTA Green Line A branch]
Generated description
The MBTA Green Line A branch was a former light rail line in Boston and its western suburbs that once ran between downtown and Watertown before being replaced by bus service.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: MBTA Green Line A branch
Target entity description: The MBTA Green Line A branch was a former light rail line in Boston and its western suburbs that once ran between downtown and Watertown before being replaced by bus service.
  • A. MBTA Green Line B branch
    The MBTA Green Line B branch is a light rail service in Boston that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
  • B. MBTA Green Line E branch
    The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
  • C. MBTA Green Line D branch
    The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
  • D. MBTA Green Line C branch
    The MBTA Green Line C branch is a light rail service in Boston and Brookline that runs primarily along Beacon Street, connecting Cleveland Circle to downtown Boston.
  • E. MBTA Blue Line
    The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
  • F. None of above. chosen

Provenance (5 batches)

The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.

Step Stage Batch ID Status When
creating Elicitation batch_69a886023194819080a3fccd6e325d0e completed March 4, 2026, 7:20 p.m.
NER Named-entity recognition batch_69a909b0738c8190b073e0ccec5e217d completed March 5, 2026, 4:42 a.m.
NED1 Entity disambiguation (via context triple) batch_69af5cac2ab08190a41b6ac9802526ee completed March 9, 2026, 11:50 p.m.
NEDg Description generation batch_69af5f9acc188190b5f13fb1f6642f1b completed March 10, 2026, 12:02 a.m.
NED2 Entity disambiguation (via description) batch_69af600decc08190bc0c1d9c46e35db8 completed March 10, 2026, 12:04 a.m.
Created at: March 4, 2026, 7:28 p.m.