Use of SKOS-XL in TNC; my take on @baskaufs 's example in https://github.com/tdwg/tag/blob/master/skos-xl/skos-xl.md

dicranum_braunii.ttl

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix skosxl: <http://www.w3.org/2008/05/skos-xl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix foaf: <http://smlns.foaf/0.1/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix dwc: <http://rs.tdwg.org/dwc/terms/> .

@prefix tnu: <http://rs.tdwg.org/tnu/> .
@prefix ex: <http://rs.tdwg.org/tnc/example/> .
@prefix voc: <http://rs.tdwg.org/tnu/vocabularies/>

ex:name-usages/1 a tnu:TaxonomicNameUsage ;
    tnu:nameUsageType voc:nameUsageType#protonym ; 
    tnu:taxonomicName :resource2 ;
    dcterms:source :resource3 .

ex:names/2 a tnu:TaxonomicName ;
    dwc:scientificName "Dicranum braunii" ;
    dwc:scientificNameAuthorship "Bosch & Sande Lac." ;
    dwc:nomenclaturalCode <http://rs.gbif.org/vocabulary/gbif/nomenclatural_code/ICN> ;
    dwc:nomenclaturalStatus <http://rs.gbif.org/vocabulary/gbif/nomenclatural_status/legitimate> ;
    dwc:namePublishedInTear "1858"^^xsd:integer ;
    dcterms:title "Dicranum braunii Bosch & Sande Lac." ;
    dwc:genus "Dicranoloma" ;
    dwc:specificEpithet "braunii" ;
    tnu:authorship "Bosch & Sande Lac." ;                                   # I prefer the ABCD way over the TCS way
    tnu:exAuthorship "Müll.Hal." ;
    tnu:protonym ex:resource1 ;                                             # hasn't actually been discussed yet
    skosxl:prefLabel ex:b33b1235-b22c-5ddb-98e3-122547c63982 ;              # name string without the 'ex' author
    skosxl:altLabel ex:7a74c523-abf3-5176-84bf-9e85ac09497f,                # name string with 'ex' author 
        ex:1275919d-bb4c-5d1b-a55e-34a126f2ad8d ;                           # name string without authorship
    skosxl:hiddenLabel ex:60b5d31d-90ca-5e4d-a56e-e74fe9adb684 .            # name string with incorrect attribution, according to ICBN

ex:references/3 a dcterms:BibliographicResource ;
    dcterms:creator ex:agents/4 ;
    dcterms:bibliographicCitation """Bosch, R.B. van der & C.M. van der Sande Lacoste (1858). 
        Fasc. 13–14: pp. 61–70 , in: F. Dozy & J.H. Molkenboer, Bryologia javanica seu descriptio 
        muscorum frondosorum Archipelagi indici iconibus illustrata. A.W. Sythof, Leiden, 
        1855-1870, 2 vols.""" .

ex:agents/4 a foaf:Group ;
    foaf:member ex:agents/5, ex:agents/6 ;
    skosxl:altLabel ex:resource14, ex:resource15 .

ex:agents/5 a foaf:Person ;
    foaf:name "Roelof Benjamin van den Bosch" ;
    foaf:familyName "Van den Bosch" ;
    foaf:givenName "Roelof Benjamin" ;
    skosxl:altLabel ex:labels/7, ex:labels/8, ex:labels/9 .

ex:agents/6 a foaf:Person ;
    foaf:name "Cornelius Marinus van der Sande Lacoste" ;
    foaf:familyName "Van der Sande Lacoste" ;
    foaf:givenName "Cornelius Marinus" ;
    skosxl:altLabel ex:labels/10, ex:labels/11, ex:labels/12 ;
    skosxl:hiddenLabel ex:labels/13 .

ex:labels/7 a skosxl:Label ;
    skosxl:literalForm "Roelof Benjamin van den Bosch" ;
    rdfs:comment "Full name"@en .

ex:labels/8 a skosxl:Label ;
    skosxl:literalForm "Bosch" ;
    dcterms:source <http://www.ipni.org/ipni/idAuthorSearch.do?id=1005-1> ;
    rdfs:comment "IPNI standard form, preferred for use in authorship of taxonomic names"@en .

ex:labels/9 a skosxl:Label ;
    skosxl:literalForm "Bosch, R.G. van der" ;
    rdfs:comment "Form preferred for use in bibliographic citations"@en .

ex:labels/10 a skosxl:Label ;
    skosxl:literalForm "Cornelius Marinus van der Sande Lacoste" ;
    rdfs:comment "Full name" .

ex:labels/11 a skosxl:Label ;
    skosxl:literalForm "Sande Lac." ;
    dcterms:source <http://www.ipni.org/ipni/idAuthorSearch.do?id=8882-1> ;
    rdfs:comment "IPNI standard form, preferred for use in authorship of taxonomic names"@en .

ex:labels/12 a skosxl:Label ;
    skosxl:literalForm "Sande Lacoste, C.M. van der" ;
    rdfs:comment "Form preferred for use in bibliographic citations"@en .

ex:labels/13 a skosxl:Label ;
    skosxl:literalForm "Lac." ;
    dcterms:source <https://www.tropicos.org/Reference/9000071> ;
    rdfs:comment "Often used in older literature; reference is to Index Muscorum"@en .

ex:labels/14 a skosxl:Label ;
    skosxl:literalForm "Bosch, R.G. van der & C.M. van der Sande Lacoste"@en ;
    rdsfs:comment "For use in bibliographic citation"@en .

ex:labels/15 a skosxl:Label ;
    skosxl:literalForm "Bosch & Sande Lac." ;
    rdfs:comment "For use in authorship of botanical names"@en .

ex:b33b1235-b22c-5ddb-98e3-122547c63982 a skosxl:Label ;
    dcterms:identifier "b33b1235-b22c-5ddb-98e3-122547c63982" ;
    skosxl:literalForm "Dicranum braunii Bosch & Sande Lac." .

ex:7a74c523-abf3-5176-84bf-9e85ac09497f a skosxl:Label ;
    dcterms:identifier "7a74c523-abf3-5176-84bf-9e85ac09497f" ;
    skosxl:literalForm "Dicranum braunii Müll.Hal. ex Bosch & Sande Lac." ;
    rdfs:comment "Includes 'ex' authorship"@en .

ex:1275919d-bb4c-5d1b-a55e-34a126f2ad8d a skos:Label ;
    dcterms:identifier "1275919d-bb4c-5d1b-a55e-34a126f2ad8d" ;
    skosxl:literalForm "Dicranum braunii" ;
    rdfs:comment "Name without authorship" .

ex:60b5d31d-90ca-5e4d-a56e-e74fe9adb684 a skosxl:Label ;
    dcterms:identifier "60b5d31d-90ca-5e4d-a56e-e74fe9adb684" ;
    skosxl:literalForm "Dicranum braunii Müll.Hal." ;
    dcterms:source <https://www.tropicos.org/Name/35122018> ;
    rdfs:comment "Tropicos incorrectly attributes Dicranum braunii to C. Müller (Müll.Hal.)"@en .