def self.disjoint_taxon_name_relationships
    self.parent.disjoint_taxon_name_relationships +
        self.collect_to_s(TaxonNameRelationship::Iczn::Invalidating::Synonym::Objective,
            TaxonNameRelationship::Iczn::Invalidating::Synonym::Objective::SynonymicHomonym,
            TaxonNameRelationship::Iczn::Invalidating::Synonym::Objective::UnnecessaryReplacementName,