Your data (which appeared at first glance to be Turtle, and this is how Virtuoso was parsing it) is just a list of subjects (entities) -- the unidentified a/k/a blank nodes -- with no predicates (attributes) or objects (values). This may help you visualize what I mean --
[ … ] .
This revision of your sample would work, but you may have a better statement to make about each of your unnamed subjects --
@prefix ns0: <http://linked.opendata.cz/ontology/chord/> .
@prefix ns1: <http://linked.opendata.cz/resource/business-entity/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
[ ns0:source ns1:CZ00006947 ;
ns0:target <http://linked.opendata.cz/resource/domain/seznam.gov.cz/rejstriky/business-entity/28175492>
] a owl:Thing .
[ ns0:source ns1:CZ00241610 ;
ns0:target <http://linked.opendata.cz/resource/domain/seznam.gov.cz/rejstriky/business-entity/60437359>
] a owl:Thing .
Alternatively, you could do this, without adding any statements --
@prefix ns0: <http://linked.opendata.cz/ontology/chord/> .
@prefix ns1: <http://linked.opendata.cz/resource/business-entity/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
[] ns0:source ns1:CZ00006947 ;
ns0:target <http://linked.opendata.cz/resource/domain/seznam.gov.cz/rejstriky/business-entity/28175492>
.
[] ns0:source ns1:CZ00241610 ;
ns0:target <http://linked.opendata.cz/resource/domain/seznam.gov.cz/rejstriky/business-entity/60437359>
.
As you have provided additional details -- that your data is N3, not Turtle -- it seems likely that your POST
is not properly identifying your submission as N3, which leads to Virtuoso's parsing error.