XmlPersistor.php

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<?php
namespace Magento\Framework\Setup;

class XmlPersistor
{
    public function persist(\SimpleXMLElement $simpleXMLElement, $path)
    {
        $dom = new \DOMDocument('1.0');
        $dom->preserveWhiteSpace = false;
        $dom->formatOutput = true;
        $dom->loadXML($simpleXMLElement->asXML());
        file_put_contents(
            $path,
            str_replace(
                ' xmlns:xsi="xsi"', //replace namespace, as we do not need it for xsi namespace
                '',
                $dom->saveXML()
            )
        );
    }
}