code: function fromXML($xmlElement)
      {
          if (isset($xmlElement->id)) $this->id = $xmlElement->id;
  
          if (isset($xmlElement->fields)) {
              $this->fields = array();
              foreach ($xmlElement->fields->children() as $field) {
                  $this->fields[trim($field->name)] = (string)$field->value; // The trim is required to make a safer string from the object
              }
          }
      }
docs: Initialization of the mailing from a simple xml element.
  
  @param SimpleXMLElement $xmlElement
  The xml element that is used to parse the mailing from.