MediaWiki non-main namespace (Q35252665)
namespace on a MediaWiki-based wiki other than the main one, with a number different from 0, and using a namespace prefix
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aliases not main namespace in Wikimedia projects
 ns <> 0
 ns != 0
 MediaWiki supplementary namespace
description namespace on a MediaWiki-based wiki other than the main one, with a number different from 0, and using a namespace prefix