try {
ExtensibilityType expression = new ExtensibilityType();
MessageElement [] elements = new MessageElement[4];
elements[0] = new MessageElement(new Text("123"));
elements[1] = new MessageElement(new Text(" 456"));
BookType book = new BookType();
book.setSubject("all");
QName elementName = _FindBooksQueryExpressionElement.getTypeDesc().getFields()[0].getXmlName();
elements[2] = new MessageElement(elementName.getNamespaceURI(), elementName.getLocalPart(), book);
elements[3] = new MessageElement(new Text("789"));
expression.set_any(elements);
// call the operation
ExtensibilityType any = binding.mixedQuery(expression);