Triple

T1708291
Position Surface form Disambiguated ID Type / Status
Subject Ashmont E36919 entity
Predicate isTransferPointFor P20604 FINISHED
Object Red Line and Mattapan Line
Red Line and Mattapan Line are two interconnected public transit rail services in the Boston area’s MBTA system, with the Mattapan Line operating as a light rail/heritage trolley branch off the Red Line.
E217798 NE FINISHED

How this triple was built (5 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: Red Line and Mattapan Line | Statement: [Ashmont, isTransferPointFor, Red Line and Mattapan Line]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: Red Line and Mattapan Line
Context triple: [Ashmont, isTransferPointFor, Red Line and Mattapan Line]
  • 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. Green Line E branch
    The Green Line E branch is a light rail service of Boston's MBTA Green Line that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street in Jamaica Plain.
  • C. 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.
  • D. 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.
  • E. 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.
  • 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: Red Line and Mattapan Line
Triple: [Ashmont, isTransferPointFor, Red Line and Mattapan Line]
Generated description
Red Line and Mattapan Line are two interconnected public transit rail services in the Boston area’s MBTA system, with the Mattapan Line operating as a light rail/heritage trolley branch off the Red Line.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: Red Line and Mattapan Line
Target entity description: Red Line and Mattapan Line are two interconnected public transit rail services in the Boston area’s MBTA system, with the Mattapan Line operating as a light rail/heritage trolley branch off the Red Line.
  • 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. Green Line E branch
    The Green Line E branch is a light rail service of Boston's MBTA Green Line that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street in Jamaica Plain.
  • C. 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.
  • D. 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.
  • E. 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.
  • F. None of above. chosen
PD Predicate disambiguation gpt-5-mini-2025-08-07
Target predicate: isTransferPointFor
Context triple: [Ashmont, isTransferPointFor, Red Line and Mattapan Line]
  • A. isReferencePointFor
    Indicates that one entity serves as a positional or conceptual basis used to locate, measure, or interpret another entity.
  • B. isTransportHubBetween chosen
    Indicates that a location functions as a central node facilitating transportation connections between two or more other places.
  • C. isMajorAccessPointFor
    Indicates that something serves as a primary or significant entry or connection point for accessing another entity or system.
  • D. isTransportationHubCodeFor
    Indicates that a given code uniquely identifies and represents a specific transportation hub, such as a station, airport, or terminal.
  • E. hasTransportHub
    Indicates that a location contains or serves as a central facility where multiple transport routes or modes connect for passenger or cargo movement.
  • F. None of above.

Provenance (6 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_69a88617439c819094ffb5d16a0f6307 completed March 4, 2026, 7:20 p.m.
NER Named-entity recognition batch_69ab75ad24408190814069e6e3ef9e59 completed March 7, 2026, 12:47 a.m.
NED1 Entity disambiguation (via context triple) batch_69adf3b9a2f4819082ca2e9f838f7b9e completed March 8, 2026, 10:10 p.m.
NEDg Description generation batch_69adf79bddf48190909bdcee31b55379 completed March 8, 2026, 10:26 p.m.
NED2 Entity disambiguation (via description) batch_69adf8153e5881908acc441f68623890 completed March 8, 2026, 10:28 p.m.
PD Predicate disambiguation batch_69aa61bad17c8190861b92cfb423f68f completed March 6, 2026, 5:10 a.m.
Created at: March 4, 2026, 7:30 p.m.