Triple

T4880287
Position Surface form Disambiguated ID Type / Status
Subject Friendship Heights station E109307 entity
Predicate line P1293 FINISHED
Object Red Line
The Red Line is a major Washington Metro rapid transit route that runs roughly northwest–southeast through Washington, D.C. and into Maryland.
 E26147 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

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 | Statement: [Friendship Heights station, line, Red Line]

Disambiguation candidates (2 decisions)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Red Line
Context triple: [Friendship Heights station, line, Red Line]
  • A. Red Line
    The Red Line is a major rapid transit route in Chicago that runs north–south through the city, serving as one of the busiest lines in its subway and elevated rail system.
  • B. Red Line
    The Red Line is a major rapid transit route in the Boston metropolitan area, operated by the MBTA and running primarily north–south through key neighborhoods and suburbs.
  • C. Red Line
    The Red Line is one of the primary heavy-rail rapid transit routes in Atlanta’s MARTA system, running north–south and serving key destinations across the metropolitan area.
  • D. Red Line
    Red Line was the original name of Los Angeles Metro’s B Line, a heavy-rail subway corridor serving key neighborhoods between Downtown Los Angeles and North Hollywood.
  • E. Red Line
    Red Line is one of the main rapid transit routes of the Dubai Metro, running along key areas of the city and serving many of its major commercial and residential districts.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Red Line
Target entity description: The Red Line is a major Washington Metro rapid transit route that runs roughly northwest–southeast through Washington, D.C. and into Maryland.
  • A. Red Line chosen
    Red Line is a major rapid transit route in the Washington Metro system, running through key areas of Washington, D.C., and its Maryland suburbs.
  • B. Red Line
    The Red Line is a major rapid transit route in the Boston metropolitan area, operated by the MBTA and running primarily north–south through key neighborhoods and suburbs.
  • C. Red Line
    The Red Line is a major rapid transit route in Chicago that runs north–south through the city, serving as one of the busiest lines in its subway and elevated rail system.
  • D. Red Line
    The Red Line is one of the primary heavy-rail rapid transit routes in Atlanta’s MARTA system, running north–south and serving key destinations across the metropolitan area.
  • E. Red Line
    The Red Line is a major rapid transit route serving Columbia, providing key north–south connections across the city.
  • F. None of above.

How the object was described

The object's one-sentence description was generated by prompting gpt-5.1 with the object name and this triple as context.

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
Triple: [Friendship Heights station, line, Red Line]
Generated description
The Red Line is a major Washington Metro rapid transit route that runs roughly northwest–southeast through Washington, D.C. and into Maryland.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69bd440e9d64819083e82cf33b4d9570 elicitation completed
NER batch_69bd6dc071d4819083ea9fd0c73c5f49 ner completed
NED1 batch_69beef8499148190968800153a95174a ned_source_triple completed
NED2 batch_69bef24df22c81908fa0c7f9620bb69b ned_description completed
NEDg batch_69bef22910e08190bed145941d40bc16 nedg completed
Created at: March 20, 2026, 1:27 p.m.