I am pretty new to SPARQL and RDF and I was wondering what exactly does the below mean in SPARQL?
[] vc:n ?vcard .
The complete query is
PREFIX vc: <http://www.w3.org/2006/vcard/ns#>SELECT ?given ?familyWHERE{ [] vc:n ?vcard . OPTIONAL {?vcard vc:given-name ?given .} OPTIONAL {?vcard vc:family-name ?family .}}