public String toString() {
String command = this.cmd.toString();
Pattern p;
// Go ahead and inject Variable Parameters
SerializationContext context = new SerializationContext(this.prefixes);
context.setBaseIRI(this.baseUri);
Iterator<String> vars = this.params.keySet().iterator();
while (vars.hasNext()) {
String var = vars.next();
Node n = this.params.get(var);
if (n == null)