Convertion node vers node URI

Salut,
comment je peux convertir un node vers node URI,

Code:

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public QueryIterator execEvaluated(Binding binding, Node subject, Node predicate, PropFuncArg object, ExecutionContext execCxt) {
 
   if (!Var.isVar(subject))
            throw new ExprEvalException("Subject is not a variable (" + subject + ")") ;
 
        if (object.getArgListSize() != 2)
            throw new ExprEvalException("Object list must contain exactly two arguments, the string to split and a regular expression") ;
 
       String s =object.getArg(0).toString();

comment je peux convertir s pour être un node URI