Tracing com.day.cq.tagging made sense, after digging through a number of messages I found one from com.day.cq.tagging.impl.JcrTagManagerImpl which actually revealed underlying query. For the record, it was:/jcr:root/content/xyz//element(*, cq:Taggable)[ (@cq:tags = 'newsroom:event' or @cq:tags = '/e...