Issue parsing query

[giacomoronconiobda]

Hello,

I found your project very good and useful. But I have an issue parsing this SPARQL query:

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
SELECT ?ed_number0 ?edr_name0 ?ath_name0 ?bk_title0 
WHERE { 
  ?edr0 <http://www.obdasystems.com/books/name> ?edr_name0 . 
  ?ath0 <http://www.obdasystems.com/books/name> ?ath_name0 . 
  ?bk0 <http://www.obdasystems.com/books/writtenBy> ?ath0 ; 
    <http://www.obdasystems.com/books/title> ?bk_title0 ; 
    <http://www.obdasystems.com/books/hasEdition> ?ed0 . 
  ?ed0 <rdf:type> <http://www.obdasystems.com/books/SpecialEdition> ; 
    <http://www.obdasystems.com/books/editionNumber> ?ed_number0 ; 
    <http://www.obdasystems.com/books/editedBy> ?edr0
}