Property:Related

''This property is deprecated, since it does not express much. General "relations" should be described by simple links that are explained within the article (e.g. in a "see also" section).''

This may refer to a given set of relations, or to a vague notion of "meaningful relation". Mathematically, of course, for all P and Q there is a relation R such that P R Q.

This is the superclass of any existing relation.

Query for any property related to another property:  property:+related:: [[property:+ ]] related::*

usage
example: anything related to perl: related::Perl results in: related::Perl

You can't simply query for anything where "Perl" is the object of a property: *::Perl results in: *::Perl