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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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#
# process magic property
# rewrite: ?x sp:test ?o
# as:      ?x sp:test [ sp:test1 ?v1 ; sp:test2 ?v2 ] . bind(concat(?v1, ?v2) as ?o) 
# 
# Olivier Corby, Wimmics Inria I3S, 2013
#
prefix sp: 
delete { 
    ?t  sp:object ?o 
    ?e rdf:rest ?r
}
insert { 
   ?t  sp:object _:b1
  
  _:b2  sp:subject _:b1 ;
    sp:predicate sp:test1 ;
    sp:object [ sp:varName "v1" ]
  
  _:b3  sp:subject _:b1 ;
    sp:predicate sp:test2 ;
    sp:object [ sp:varName "v2" ]
 
  _:b4 a sp:Bind ;
    sp:expression    [ a sp:concat  ;
     sp:arg1 [ sp:varName "v1" ] ;
     sp:arg2 [ sp:varName "v2" ] ;
    ] ;
    sp:variable ?o 

   ?e rdf:rest [
        rdf:first _:b2 ; rdf:rest [
        rdf:first _:b3 ; rdf:rest [
        rdf:first _:b4 ; rdf:rest ?r]]]
}
where {
  
  ?e rdf:first ?t ;
     rdf:rest ?r 

  ?t sp:subject ?s ;
    sp:predicate sp:test ;
    sp:object ?o
}