From semantic-mediawiki.org

Configuration parameter details:
Name $smwgQDisjunctionSupport
Description Sets whether disjunctions are supported in queries
Default setting
(Other) available settings

Allows to disable disjunction support in queries

Software Semantic MediaWiki
Since version
Until version
Configuration Query settings · inline queries · Query features · Query performance
Keyword inline queries

$smwgQDisjunctionSupport is a configuration parameter that sets whether disjunctions are supported in queries ("||" and "OR"). The configuration parameter was introduced in Semantic MediaWiki 1.0Released on 31 December 2007 and compatible with MW 1.9.x - 1.12.x. and removed in Semantic MediaWiki 1.2.0Released on 10 July 2008 and compatible with MW 1.11.x - 1.14.x. meaning that disjunctions will always be supported.

Things like namespace defaults and property as well as category hierarchies can also cause disjunctions!

See also[edit]