Property talk:P1221

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compressor type
type of mechanical compressor technology used by subject

Description	type of compressor - compressor (Q178898)
Represents	compressor (Q178898)
Data type	Item
Template parameter	w:en:Template:jetspecs : compressor
Domain	According to this template: jet engines - types of aircraft engine (Q743004) According to statements in the property: aircraft engine (Q743004) When possible, data should only be stored as statements
Allowed values	types of compressor (Q178898) (note: this should be moved to the property statements)
Example	Westinghouse J30 (Q7988946) → axial compressor (Q742777) Nakajima Sakae (Q2708163) → pistonless rotary engine (Q4398673)
Robot and gadget jobs	importation from articles using template 'jetspecs'
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) Database reports/Constraint violations/P1221 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 4 Main statement 2 50% of uses Qualifier 2 50% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “aircraft engine (Q743004)”: item must contain property “subclass of (P279)” with classes “aircraft engine (Q743004)” 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/P1221#Type Q743004, SPARQL

Value type “compressor (Q178898)”: This property should use items as value that contain property “subclass of (P279)”. On these, the value for subclass of (P279) should be an item that uses subclass of (P279) with value compressor (Q178898) (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/P1221#Value type Q178898, 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/P1221#Scope, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200), Wikibase MediaInfo (Q59712033): the property may only be used on a certain entity type (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/P1221#Entity types