invalid JSON query output with newlines in literal values

[Mikael Högqvist]

Input data:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE owl [
        <!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
        <!ENTITY xsd 'http://www.w3.org/2001/XMLSchema#'>
]>
<rdf:RDF xmlns:rdf="&rdf;"
        xmlns:xsd="&xsd;"
 >

<rdf:Description rdf:about="http://somewhere/JohnSmith/">
  <rdf:value>This
is
some
multi-line
text
literal</rdf:value>
</rdf:Description>

</rdf:RDF>

Query:

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT ?value
WHERE {
  ?bla rdf:value ?value ;
}

This returns invalid JSON looking something like this:

{ "head" : { "vars" : [ "value" ] },
    "results" : { "ordered" : false, "distinct" : false, "bindings" : [ {
                   "value" : {"type": "literal", "xml:lang" : "None", "value" : "This
is
some
multi-line
text
literal"}}]}}

The newline characters should be escaped.