src/Entity/Dimensions.php
public function toNode(DOMDocument $document = null)
    {
        if (null === $document) {
            $document = new DOMDocument();
        }

        $node = $document->createElement('Dimensions');
        $node->appendChild($document->createElement('Length', $this->getLength()));
        $node->appendChild($document->createElement('Height', $this->getHeight()));
        $node->appendChild($document->createElement('Width', $this->getWidth()));
        $node->appendChild($this->getUnitOfMeasurement()->toNode($document));

        return $node;
    }
public function toNode(DOMDocument $document = null)
    {
        if (null === $document) {
            $document = new DOMDocument();
        }

        $node = $document->createElement('Dimensions');
        $node->appendChild($document->createElement('Length', $this->getLength()));
        $node->appendChild($document->createElement('Height', $this->getHeight()));
        $node->appendChild($document->createElement('Width', $this->getWidth()));
        $node->appendChild($this->getUnitOfMeasurement()->toNode($document));

        return $node;
    }
@param null|DOMDocument $document

@return DOMElement