Error in code list encodings?

When executing the following query on https://def.isotc211.org/ontologies/iso19115/-1/2018/CitationAndResponsiblePartyInformation.rdf using ARQ

prefix dcat: <http://www.w3.org/ns/dcat#>
prefix dct: <http://purl.org/dc/terms/>
prefix dctype: <http://purl.org/dc/dcmitype/>
prefix foaf: <http://xmlns.com/foaf/0.1/>
prefix owl: <http://www.w3.org/2002/07/owl#>
prefix prov: <http://www.w3.org/ns/prov#>
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix sdo: <http://schema.org/>
prefix skos: <http://www.w3.org/2004/02/skos/core#>
prefix vcard: <http://www.w3.org/2006/vcard/ns#>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
prefix dc: <http://purl.org/dc/elements/1.1/>
prefix iso19150-2: <http://def.isotc211.org/iso19150/-2/2012/base#>
prefix iso19115-1_445: <http://def.isotc211.org/iso19115/-1/2014/CommonClasses#>
prefix iso19115-1_455: <http://def.isotc211.org/iso19115/-1/2014/ExtentInformation#>
prefix iso19115-1: <http://def.isotc211.org/iso19115/-1/2018/CitationAndResponsiblePartyInformation#>
prefix iso19115-1Code: <http://def.isotc211.org/iso19115/-1/2018/CitationAndResponsiblePartyInformation/code/>

SELECT ?prefLabel ?definition
WHERE {
    ?concept skos:prefLabel ?prefLabel;
             skos:definition ?definition;
             skos:inScheme <http://def.isotc211.org/iso19115/-1/2018/CitationAndResponsiblePartyInformation/code/CI_RoleCode>.
}
ORDER BY ?prefLabel

arq.bat --data=https://def.isotc211.org/ontologies/iso19115/-1/2018/CitationAndResponsiblePartyInformation.rdf --results=CSV --file="C:\path\to\file\containing\query" > "C:\path\to\output\as\csv"

I get the following error:

ERROR riot                 :: [line: 1298, col: 78] {E201} rdf:resource not allowed as attribute here.
Failed to load data

When using a copy of CitationAndResponsiblePartyInformation.rdf in which all occurrences of <skos:Concept rdf:resource are changed to <skos:Concept rdf:about , the query is executed fine and I get the result I expect. I am not sure though, that that RDF actually is correct according to the SKOS spec, but at least I don't get an error.

I cannot find a description of skos:members in https://www.w3.org/TR/skos-reference/#collections , I can can only find skos:member and skos:memberList. Should the SKOS Collections be encoded in a slightly different way in order to conform to the spec?

ISO-TC211 / GOM

Error in code list encodings? #11