@Override
public SPARQLObject toSPARQL() {
log.debug("Parameter Function : "+parameterFunctionAtom.toSPARQL().getObject());
String variableArgument = variable.toString().replace("http://kres.iks-project.eu/ontology/meta/variables#", "");
String let = "LET (?" + variableArgument + " := " + parameterFunctionAtom.toSPARQL().getObject() + ")";
SPARQLObject sparqlObject = new SPARQLFunction(let);
return sparqlObject;
}