SPARQL Update example for updating more than one triple in a single query

Question

Can anyone point me to a valid UPDATE statement in SPARQL in any documentation (be it W3C, virtuoso, semantic web page, or your own custom code, etc?

It has to be complete with WHERE specifications and more than one triple being updated in a single query.

Thanks.

EDIT / Example:

Here is my current code, which has the goal of replacing all current values of dc:creator, dc:title and dc:description with the ones specified in the INSERT clause. Is this query correct, both in logic and syntax?

WITH GRAPH  <http://127.0.0.1:3000/dendro_graph>  
DELETE 
{ 
  :teste  dc:creator      ?o0 .
  :teste  dc:title        ?o1 .
  :teste  dc:description  ?o2 .
}
INSERT 
{ 
  :teste  dc:creator      "Creator%201" .
  :teste  dc:creator      "Creator%202" .
  :teste  dc:title        "Title%201" .
  :teste  dc:description  "Description%201" .
} 
WHERE 
{ 
  :teste  dc:creator      ?o0 .
  :teste  dc:title        ?o1 .
  :teste  dc:description  ?o2 .
} 

Answer 1

It's still not entirely clear to me what you're trying to achieve and why the example update that you give is not doing what you want, but if the aim is to have an update that replaces triples for a given subject, you could do something like this:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
@prefix ex: <http://example.org/> 

DELETE {?s ?p ?o}
INSERT {?s ex:title "foo" ;
           ex:description "bar" ;
           rdf:type ex:FooBar .  
       }
WHERE  { ?s ?p ?o . 
         FILTER (?s = ex:subject1) 
}

The above operation will delete all existing triples with ex:subject1 as the subject, and insert a new title, description, and type.

Or if you don't like filters, you can also formulate the above like this:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
@prefix ex: <http://example.org/> 

DELETE {ex:subject1 ?p ?o}
INSERT {ex:subject1 ex:title "foo" ;
                    ex:description "bar" ;
                    rdf:type ex:FooBar .  
}
WHERE  { 
        ex:subject1 ?p ?o . 
}

If you only want to delete specific properties for a given subject (rather than all triples with that subject), you can modify the operation like so:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
@prefix ex: <http://example.org/> 

DELETE {ex:subject1 ex:title ?t ;
                    ex:description ?d ; 
                    rdf:type ?c . 
       }
INSERT {ex:subject1 ex:title "foo" ;
                    ex:description "bar" ;
                    rdf:type ex:FooBar .  
}
WHERE  { 
        ex:subject1 ex:title ?t ;
                    ex:description ?d ;
                    rdf:type ?c . 
}

Answer 2

In SPARQL updates are represented as a DELETE followed by an INSERT:

http://www.w3.org/TR/2010/WD-sparql11-update-20100126/#t413

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

WITH <http://example/addresses>
DELETE { ?person foaf:firstName 'Bill' }
INSERT { ?person foaf:firstName 'William' }
WHERE
  { ?person a foaf:Person .
    ?person foaf:firstName 'Bill'
  }