/** {@inheritDoc} */
protected void processChildElement(XMLObject parentXMLObject, XMLObject childXMLObject)
throws UnmarshallingException {
if(childXMLObject instanceof ExpressionType){
VariableReferenceType variableReferenceType = (VariableReferenceType) parentXMLObject;
variableReferenceType.getExpressions().add((ExpressionType)childXMLObject);
} else {
super.processChildElement(parentXMLObject, childXMLObject);
}
}