Help:$smwgSimilarityLookupExemptionProperty

is a configuration parameter that sets the property used to exclude a property from being evaluated during similarity checks, i.e. the listed property is used to exclude a property from the similarity lookup in case the comparing property contains an annotation value with the exemption property. It was introduced in Semantic MediaWiki 2.5.0.CiteRef::gh:smw:2244

This configuration parameter usually does not need any modification.