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Property:Query depth
From SWMC Wiki
"Query depth" is a predefined property that informs about the depth (numerical value computed on the basis of subquery nesting and resolved property chains) of a query while query execution is being restricted by the $smwgQMaxDepth setting 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.