private const string document1 = "<?xml version='1.0' ?>"
            + "<document attribute='value'>"
            + " <item>text</item>"
            + "</document>";

        private const string document2 = "<?xml version='1.0' ?>\r\n"
            + "<document attribute='value'>\r\n"
            + " <item>text</item>\r\n"
            + "</document>\r\n";

        private const string document3 = @"<?xml version='1.0' ?>
            <document attribute='value'>
                <item>text</item>
            </document>";