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For examples of extensions using this hook, see Category:BSUEModulePDFcollectMetaData extensions . Category:Extension hooks#BSUEModulePDFcollectMetaData Category:Undocumented extension hooks#BSUEModulePDFcollectMetaData Category:Extension hooks provided by UEModulePDF Category:Extension hooks#BSUEModulePDFcollectMetaData Category:Undocumented extension hooks#BSUEModulePDFcollectMetaData Category:Extension hooks provided by UEModulePDF