Triple

T9903755
Position Surface form Disambiguated ID Type / Status
Subject Watertown branch of the Green Line A E182351 entity
Predicate alsoKnownAs P39 FINISHED
Object Green Line A branch
Green Line A branch was a former branch of Boston’s MBTA Green Line light rail system that once ran to Watertown before being discontinued.
 E828072 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: Green Line A branch | Statement: [Watertown branch of the Green Line A, alsoKnownAs, Green Line A branch]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Green Line A branch
Context triple: [Watertown branch of the Green Line A, alsoKnownAs, Green Line A branch]
  • A. Green Line B branch
    The Green Line B branch is a light rail service of Boston's MBTA Green Line that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
  • B. Green Line C Branch
    The Green Line C Branch is a light rail service of Boston's MBTA Green Line that runs primarily along Beacon Street between downtown Boston and the suburb of Brookline.
  • C. 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.
  • D. Green Line branches
    Green Line branches are the multiple service routes of Boston's MBTA Green Line light rail system that diverge to serve different neighborhoods and suburbs.
  • E. Green Line southern leg
    The Green Line southern leg is the portion of Washington, D.C.’s Metrorail Green Line that runs south from downtown through neighborhoods such as Anacostia toward the system’s southern terminus.
  • 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: Green Line A branch
Triple: [Watertown branch of the Green Line A, alsoKnownAs, Green Line A branch]
Generated description
Green Line A branch was a former branch of Boston’s MBTA Green Line light rail system that once ran to Watertown before being discontinued.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Green Line A branch
Target entity description: Green Line A branch was a former branch of Boston’s MBTA Green Line light rail system that once ran to Watertown before being discontinued.
  • A. Green Line B branch
    The Green Line B branch is a light rail service of Boston's MBTA Green Line that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
  • B. Green Line C Branch
    The Green Line C Branch is a light rail service of Boston's MBTA Green Line that runs primarily along Beacon Street between downtown Boston and the suburb of Brookline.
  • C. 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.
  • D. Green Line branches
    Green Line branches are the multiple service routes of Boston's MBTA Green Line light rail system that diverge to serve different neighborhoods and suburbs.
  • E. Green Line southern leg
    The Green Line southern leg is the portion of Washington, D.C.’s Metrorail Green Line that runs south from downtown through neighborhoods such as Anacostia toward the system’s southern terminus.
  • 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_69ca82876f8081909cf75df0f99bb13f completed March 30, 2026, 2:02 p.m.
NER Named-entity recognition batch_69cdb4e4f92c81908e38509416f19c78 completed April 2, 2026, 12:14 a.m.
NED1 Entity disambiguation (via context triple) batch_69d1eb2778bc81909d7e09da718d9afa completed April 5, 2026, 4:55 a.m.
NEDg Description generation batch_69d1ed4003fc8190ba7f96913abc55e0 completed April 5, 2026, 5:04 a.m.
NED2 Entity disambiguation (via description) batch_69d1ed99963881908dd14786a2e2e87f completed April 5, 2026, 5:05 a.m.
Created at: March 30, 2026, 8:40 p.m.