Property: Subproperty of
From Labki
"Subproperty of" is a declarative predefined property to define that a property is a subproperty of another and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
Page Parent property that this property specializes. Property
... more about "Subproperty of"