C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/Barcode/Upca.php

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<?php
require_once 'Zend/Validate/Barcode/AdapterAbstract.php';

class Zend_Validate_Barcode_Upca extends Zend_Validate_Barcode_AdapterAbstract
{
    protected $_length = 12;

    protected $_characters = '0123456789';

    protected $_checksum = '_gtin';
}