Element.php

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<?php
namespace Magento\Shipping\Model\Simplexml;

class Element extends \Magento\Framework\Simplexml\Element
{
    public function addAttribute($name, $value = null, $namespace = null)
    {
        if ($value !== null) {
            $value = $this->xmlentities($value);
        }
        parent::addAttribute($name, $value, $namespace);
    }

    public function addChild($name, $value = null, $namespace = null)
    {
        if ($value !== null) {
            $value = $this->xmlentities($value);
        }
        return parent::addChild($name, $value, $namespace);
    }

    public function xmlentities($value = null)
    {
        $value = str_replace('&amp;', '&', $value);
        $value = str_replace('&', '&amp;', $value);
        return $value;
    }
}