Help:Inverse properties
Since SMW 1.5.0, it is possible to invert the direction of a property with datatype Page in semantic search (inline queries, concepts) and on browsing interfaces (Special:Ask, Special:Browse).
In order to achieve this simply write "-" in front of property name anywhere in SMW to refer to the inverse direction of a property. Thus the property that relates to the same pages but with annotated page and property value exchanged. For example, the inverse of "parent of" is "-parent of". This intuitively means "child of". Because of this a property with that name does not have to be created and annotated explicitely. However, note that "-father of" corresponds to "has male parent" not to "son of"!
SMW does not support naming of inverses, but allows them to be used for retrieving data. This works in browsing interfaces, queries, and query output directives. In queries it works only for properties of datatype Page.
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