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Corese is a Semantic Web Factory (triple store and SPARQL endpoint) implementing RDF, RDFS, SPARQL 1.1 Query and Update.

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#
# Embed statements of select where inside optional
# Olivier Corby, Wimmics Inria I3S, 2013
#
prefix sp: 
delete { ?e rdf:first ?s }
insert { ?e rdf:first [ a sp:Optional ; sp:elements( ?s ) ]}
where {
  ?q a sp:Select ; 
  sp:where/rdf:rest* ?e
  ?e rdf:first ?s 
  filter not exists { ?s a ?t  values ?t {sp:Minus sp:Optional }}
}