I'm probably misunderstanding this graph pattern or the data
?paper iospress:publicationDate ?pubDate ;
iospress:publicationIncludesKeyword ?keyword;
iospress:publicationAuthorList [ ?idx ?author ] .
but just in case this author list is an RDF list, then it won't work as
intended to get all authors with position. Or did you really model it as
a bunch of bnodes with a separate property per index? I mean, the ?idx
has to be a URI.
If it is a list, maybe ARQ extension might useful:
https://jena.apache.org/documentation/query/rdf_lists.html
