WordPress - Pass URL (with ? and &) to shortcode_atts in shortcode function

functions.php

// Add following code into functions.php of WordPress theme

function willhill_text($atts) {
	extract( shortcode_atts( array(
		"xmlurl"=>'http://'),
		$atts
		)
 	);

 	$str_format = str_replace(array("&","&"), "&", $xmlurl);

 	$rss = simplexml_load_file(esc_url_raw($str_format));
 	print_r($rss);
}
add_shortcode('willhill_text_link', 'willhill_text');

// Add the following shortcode in Post / Page

[willhill_text_link xmlurl="http://cachepricefeeds.williamhill.com/openbet_cdn?action=template&template=getHierarchyByMarketType&classId=313&marketSort=--&filterBIR=N"]