M21 line
E648167
The M21 line is a rapid transit route within the Istanbul Metro system serving passengers in Istanbul, Turkey.
All labels observed (1)
| Label | Occurrences |
|---|---|
| M21 line canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7175665 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: M21 line Context triple: [Istanbul Metro, hasLine, M21 line]
-
A.
M20 line
The M20 line is a rapid transit route within the Istanbul Metro system, serving as part of the city's urban rail network.
-
B.
M2 line
The M2 line is a fully automated metro line in Lausanne, Switzerland, running on a steep north–south route that connects the city center with surrounding districts and the lakeshore.
-
C.
M2 line
The M2 line is a major rapid transit route within the Ankara Metro system in Turkey, serving key districts of the capital city.
-
D.
M2 line
The M2 line is one of the main lines of the Helsinki Metro rapid transit system, serving key districts across the Helsinki metropolitan area.
-
E.
M36 line
The M36 line is a metro route within the Istanbul Metro system that serves as part of the city's rapid transit network.
- 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: M21 line Target entity description: The M21 line is a rapid transit route within the Istanbul Metro system serving passengers in Istanbul, Turkey.
-
A.
M20 line
The M20 line is a rapid transit route within the Istanbul Metro system, serving as part of the city's urban rail network.
-
B.
M2 line
The M2 line is a fully automated metro line in Lausanne, Switzerland, running on a steep north–south route that connects the city center with surrounding districts and the lakeshore.
-
C.
M2 line
The M2 line is a major rapid transit route within the Ankara Metro system in Turkey, serving key districts of the capital city.
-
D.
M2 line
The M2 line is one of the main lines of the Helsinki Metro rapid transit system, serving key districts across the Helsinki metropolitan area.
-
E.
M36 line
The M36 line is a metro route within the Istanbul Metro system that serves as part of the city's rapid transit network.
- F. None of above. chosen
Statements (24)
| Predicate | Object |
|---|---|
| instanceOf |
public transport route
ⓘ
rapid transit line ⓘ |
| country | Turkey ⓘ |
| electrification | electric traction ⓘ |
| fareSystem | Istanbul public transport fare system ⓘ |
| governedBy |
local transport authorities of Istanbul
ⓘ
linked to:
Metro Istanbul
|
| hasInfrastructureType | grade-separated rail ⓘ |
| hasLanguageOfSignage | Turkish ⓘ |
| hasRollingStockType | electric multiple units ⓘ |
| isPartOf | public transportation network of Istanbul ⓘ |
| isRapidTransit | true ⓘ |
| isUrbanRail | true ⓘ |
| locatedIn |
Istanbul
ⓘ
Turkey ⓘ |
| modeOfTransport | rapid transit ⓘ |
| network |
Istanbul urban rail network
ⓘ
linked to:
Istanbul public transport network
|
| operatorLocation | Istanbul ⓘ |
| partOf | Istanbul Metro ⓘ |
| primaryFunction | passenger transport ⓘ |
| serves | passengers in Istanbul ⓘ |
| serviceType |
metro service
ⓘ
urban rail transit ⓘ |
| transportSystem |
Istanbul Metro system
ⓘ
linked to:
Istanbul Metro
|
| usedFor | urban passenger mobility ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: M21 line Description of subject: The M21 line is a rapid transit route within the Istanbul Metro system serving passengers in Istanbul, Turkey.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.