code: public function toNode(DOMDocument $document = null)
      {
          if (null === $document) {
              $document = new DOMDocument();
          }
  
          $node = $document->createElement('Address');
          if ($this->getAddressLine1()) {
              $node->appendChild($document->createElement('AddressLine1', $this->getAddressLine1()));
          }
  
          if ($this->getAddressLine2()) {
              $node->appendChild($document->createElement('AddressLine2', $this->getAddressLine2()));
          }
          if ($this->getAddressLine3()) {
              $node->appendChild($document->createElement('AddressLine3', $this->getAddressLine3()));
          }
          if ($this->getCity()) {
              $node->appendChild($document->createElement('City', $this->getCity()));
          }
          if ($this->getStateProvinceCode()) {
              $node->appendChild($document->createElement('StateProvinceCode', $this->getStateProvinceCode()));
          }
          if ($this->getPostalCode()) {
              $node->appendChild($document->createElement('PostalCode', $this->getPostalCode()));
          }
          if ($this->getCountryCode()) {
              $node->appendChild($document->createElement('CountryCode', $this->getCountryCode()));
          }
          if ($this->getResidentialAddressIndicator()) {
              $node->appendChild($document->createElement('ResidentialAddressIndicator'));
          }
  
          return $node;
      }
docs: @param null|DOMDocument $document
  
  @return DOMElement