Converter.php

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<?php
namespace Magento\Customer\Model\Address\Config;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    public function convert($source)
    {
        $output = [];
        $formats = $source->getElementsByTagName('format');
        foreach ($formats as $formatConfig) {
            $formatCode = $formatConfig->attributes->getNamedItem('code')->nodeValue;
            $output[$formatCode] = [];
            for ($attributeIndex = 0; $attributeIndex < $formatConfig->attributes->length; $attributeIndex++) {
                $output[$formatCode][$formatConfig->attributes->item(
                    $attributeIndex
                )->nodeName] = $formatConfig->attributes->item(
                    $attributeIndex
                )->nodeValue;
            }
        }
        return $output;
    }
}