As it was pointed out [1] version 1.8.0 already requires PHP 5.3+ which should not be the case. Since SMW 1.8+ is keeping PHP 5.2 compatibility this extensions should do it, too. Additionally this would make this extension compatible with MW 1.19 LTS in an PHP 5.2 environment.
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URL: http://semantic-mediawiki.org/wiki/Thread:Talk:Semantic_Result_Formats/Doesn%27t_run_on_MediaWiki_1.19_minimal_requirements