"Query string" is a predefined property that describes the conditions of the query as a string 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.
[[Category:Species]] <q> <q>[[Appears in::Episode:0-8-4]]</q> OR <q>[[Appears in deleted scenes of::Episode:0-8-4]]</q> OR <q>[[Deceased in::Episode:0-8-4]]</q> OR <q>[[Mentioned in::Episode:0-8-4]]</q> </q>
[[Category:Events]] <q> <q>[[Appears in::Episode:0-8-4]]</q> OR <q>[[Appears in deleted scenes of::Episode:0-8-4]]</q> OR <q>[[Mentioned in::Episode:0-8-4]]</q> </q>
[[Category:Organizations]] <q> <q>[[Appears in::Episode:0-8-4]]</q> OR <q>[[Appears in deleted scenes of::Episode:0-8-4]]</q> OR <q>[[Deceased in::Episode:0-8-4]]</q> OR <q>[[Mentioned in::Episode:0-8-4]]</q> </q>