/usr/share/php/Sabre/DAV/Property.php is in php-sabre-dav 1.8.12-1ubuntu2.
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The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | <?php
namespace Sabre\DAV;
/**
 * Abstract property class
 *
 * Extend this class to create custom complex properties
 *
 * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
abstract class Property implements PropertyInterface {
    /**
     * Unserializes the property.
     *
     * This static method should return a an instance of this object.
     *
     * @param \DOMElement $prop
     * @return DAV\IProperty
     */
    static function unserialize(\DOMElement $prop) {
        throw new Exception('Unserialize has not been implemented for this class');
    }
}
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