AddressData.php

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<?php

namespace Sabre\CardDAV\Xml\Filter;

use Sabre\Xml\Reader;
use Sabre\Xml\XmlDeserializable;

class AddressData implements XmlDeserializable {

    static function xmlDeserialize(Reader $reader) {

        $result = [
            'contentType' => $reader->getAttribute('content-type') ?: 'text/vcard',
            'version'     => $reader->getAttribute('version') ?: '3.0',
        ];

        $elems = (array)$reader->parseInnerTree();
        $result['addressDataProperties'] = array_map(function($element) {
            return $element['attributes']['name'];
        }, $elems);

        return $result;

    }

}