Triple

T10986337
Position Surface form Disambiguated ID Type / Status
Subject MacArthur BART station E259638 entity
Predicate isOnCorridor P1018 FINISHED
Object Richmond–Oakland–San Francisco corridor
The Richmond–Oakland–San Francisco corridor is a major urban and transportation axis in the San Francisco Bay Area linking the cities of Richmond, Oakland, and San Francisco.
 E898221 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: Richmond–Oakland–San Francisco corridor | Statement: [MacArthur BART station, isOnCorridor, Richmond–Oakland–San Francisco corridor]

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: Richmond–Oakland–San Francisco corridor
Context triple: [MacArthur BART station, isOnCorridor, Richmond–Oakland–San Francisco corridor]
  • A. Los Angeles–San Francisco
    Los Angeles–San Francisco refers to the major intercity corridor in California connecting the state’s largest southern metropolis with its iconic northern bay city, historically served by prominent rail and highway routes.
  • B. Chicago–San Francisco corridor
    The Chicago–San Francisco corridor is a major historic transcontinental rail route linking the Midwestern United States with the Pacific Coast across the Great Plains and the Rocky Mountains.
  • C. Alameda/Oakland–San Francisco route
    The Alameda/Oakland–San Francisco route is a commuter and tourist ferry service across San Francisco Bay connecting the East Bay cities of Alameda and Oakland with San Francisco.
  • D. South Bay–East Bay commute corridor
    The South Bay–East Bay commute corridor is a major regional travel route in the San Francisco Bay Area connecting residential and employment centers between the South Bay and East Bay.
  • E. Eugene–Portland–Seattle–Vancouver corridor
    The Eugene–Portland–Seattle–Vancouver corridor is a major north–south passenger rail and transportation route in the Pacific Northwest, linking key cities in Oregon, Washington, and British Columbia.
  • 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: Richmond–Oakland–San Francisco corridor
Target entity description: The Richmond–Oakland–San Francisco corridor is a major urban and transportation axis in the San Francisco Bay Area linking the cities of Richmond, Oakland, and San Francisco.
  • A. Los Angeles–San Francisco
    Los Angeles–San Francisco refers to the major intercity corridor in California connecting the state’s largest southern metropolis with its iconic northern bay city, historically served by prominent rail and highway routes.
  • B. Chicago–San Francisco corridor
    The Chicago–San Francisco corridor is a major historic transcontinental rail route linking the Midwestern United States with the Pacific Coast across the Great Plains and the Rocky Mountains.
  • C. Alameda/Oakland–San Francisco route
    The Alameda/Oakland–San Francisco route is a commuter and tourist ferry service across San Francisco Bay connecting the East Bay cities of Alameda and Oakland with San Francisco.
  • D. South Bay–East Bay commute corridor
    The South Bay–East Bay commute corridor is a major regional travel route in the San Francisco Bay Area connecting residential and employment centers between the South Bay and East Bay.
  • E. Eugene–Portland–Seattle–Vancouver corridor
    The Eugene–Portland–Seattle–Vancouver corridor is a major north–south passenger rail and transportation route in the Pacific Northwest, linking key cities in Oregon, Washington, and British Columbia.
  • F. None of above. chosen

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: Richmond–Oakland–San Francisco corridor
Triple: [MacArthur BART station, isOnCorridor, Richmond–Oakland–San Francisco corridor]
Generated description
The Richmond–Oakland–San Francisco corridor is a major urban and transportation axis in the San Francisco Bay Area linking the cities of Richmond, Oakland, and San Francisco.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69d6aa895f4c8190887a15460ef622f4 elicitation completed
NER batch_69d787b2e4a88190a81504eee77e2298 ner completed
NED1 batch_69e344e9c66c81909163cea6aa9276e0 ned_source_triple completed
NED2 batch_69e3591ecd548190b049ce95fe3f86d9 ned_description completed
NEDg batch_69e3556e8b408190a02a1fe194ae5750 nedg completed
Created at: April 8, 2026, 9:24 p.m.