Hola guys!

When implementing a SparqleW3CTupleWriter for 
https://jira.duraspace.org/browse/FCREPO-1023 in Trippi, which i 
basically copied from SparqlTupleWriter, i stumbled upon this null check in
https://github.com/fcrepo/trippi/blob/master/trippi-core/src/main/java/org/trippi/io/SparqlTupleWriter.java
 
at line 55:

...
Node n = result.get(names[i]);
if ( n == null ) {
     m_out.println(" bound=\"false\"/>");
} else if ( n instanceof URIReference ) {
...

Im not quite sure how to handle this null checks in a Tuple Writer 
conforming to the docuemtnation at http://www.w3.org/TR/rdf-sparql-XMLres/


Can you give me a hint on how to handle these null nodes?

-- 
*frank asseg*
softwareentwicklung
feichtmayrstrasse 37
76646 bruchsal
tel.: ++49-7251-322-6073
fax.: ++49-7251-322-6078
mail: frank.as...@congrace.de
web: http://www.congrace.de/

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