def self.disjoint_taxon_name_relationships
    self.parent.disjoint_taxon_name_relationships +
        self.collect_to_s(TaxonNameRelationship::Icn::Unaccepting::Synonym::Homotypic,
            TaxonNameRelationship::Icn::Unaccepting::Synonym::Homotypic::AlternativeName,
            TaxonNameRelationship::Icn::Unaccepting::Synonym::Homotypic::OrthographicVariant,