Property talk:P3019

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railway signalling system
type of signalling used on this railway line

Represents	railway signalling system (Q1316667)
Data type	Item
Template parameter	|signalsystem= in sv:Mall:Infobox järnväg
Domain	According to this template: railway line (Q728937) According to statements in the property: railway line (Q728937) When possible, data should only be stored as statements
Example	Ådalen Line (Q1799633) → European Rail Traffic Management System (Q687308) Bari–Barletta railway line (Q16555751) → Telephonic block (Q228459) West Highland Line (Q233283) → radio electronic token block (Q2126061)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P3019 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 143 Main statement 140 97.9% of uses Qualifier 3 2.1% of uses
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Type “railway line (Q728937)”: item must contain property “instance of (P31)” with classes “railway line (Q728937)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3019#Type Q728937, SPARQL

Value type “railway signalling system (Q1316667)”: This property should use items as value that contain property “instance of (P31)”. On these, the value for instance of (P31) should be an item that uses subclass of (P279) with value railway signalling system (Q1316667) (or a subclass thereof). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3019#Value type Q1316667, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P3019#Scope, hourly updated report, SPARQL