How can I extract value based on the specific tag?

Hello,
I have a sample xml file:
<?xml version="1.0" encoding="UTF-8"?>
<listings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://local.google.com/local_feed.xsd">
<language>en</language>
<datum>WGS84</datum>
<listing>
<id>242238</id>
<name>Baskin-Robbins</name>
<date month="5" day="13" year="2010" />
<content>
<text type="menu">
<link>http://www.allmenus.com/ca/san-fernando-valley/242238-baskin-robbins/menu/</link>
<title>Baskin-Robbins</title>
<author>Allmenus.com</author>
<body>View this menu online at Allmenus.com</body>
</text>
<attributes>
<link>http://www.allmenus.com/ca/san-fernando-valley/242238-baskin-robbins/menu/</link>
<title>Baskin-Robbins</title>
<attr name="Average Entree">$41.95</attr>
<attr name="Cuisine">Ice Cream</attr>
<attr name="Cuisine">American</attr>
<attr name="Payment accepted">Cash</attr>
<attr name="Feature">Cheap Eats</attr>
<attr name="Feature">Kid Friendly</attr>
<attr name="Feature">Fast Food</attr>
<date month="5" day="13" year="2010" />
</attributes>
</content>
</listing>
<listing>
<id>243810</id>
<name>Villa Maria Pizzeria & Restaurant</name>
<date month="5" day="13" year="2010" />
<content>
<text type="menu">
<link>http://www.allmenus.com/ny/nassau-county/243810-villa-maria-pizzeria--restaurant/menu/</link>
<title>Villa Maria Pizzeria & Restaurant</title>
<author>Allmenus.com</author>
<body>View this menu online at Allmenus.com</body>
</text>
<attributes>
<link>http://www.allmenus.com/ny/nassau-county/243810-villa-maria-pizzeria--restaurant/menu/</link>
<title>Villa Maria Pizzeria & Restaurant</title>
<attr name="Hours">Sun 12pm-9pm; Mon 11am-10pm; Tue 11am-10pm; Wed 11am-10pm; Thu 11am-10pm; Fri 11am-10pm; Sat 11am-10pm</attr>
<attr name="Last Delivery">Sun 9pm; Mon 10pm; Tue 10pm; Wed 10pm; Thu 10pm; Fri 10pm; Sat 10pm</attr>
<attr name="Order Online">http://orders.allmenus.com/restaurant.asp?restid=5999&campusid=835</attr>
<attr name="Average Entree">$7.95</attr>
<attr name="Minimum for Delivery">$25.00</attr>
<attr name="Cuisine">Pizza</attr>
<attr name="Cuisine">Sandwiches</attr>
<attr name="Cuisine">Calzones</attr>
<attr name="Payment accepted">Cash</attr>
<attr name="Payment accepted">Visa</attr>
<attr name="Payment accepted">Mastercard</attr>
<attr name="Payment accepted">Discover</attr>
<attr name="Payment accepted">Amex</attr>
<attr name="Nearby School">Hofstra University</attr>
<attr name="Nearby School">SUNY-Farmingdale</attr>
<attr name="Feature">Free Delivery</attr>
<attr name="Feature">Open 7 Days</attr>
<attr name="Online Order">Yes</attr>
<date month="5" day="13" year="2010" />
</attributes>
</content>
</listing>
</listings>
As you can see, some row has <attr name="Order Online"> and some don't. I want to extract value of this attribute. It can be null for rows that don't have this attribute. How can I do it with extractvalue function? THANKS A LOT!

I figured it out that I should do the following:
select extractvalue(value(x),'/listing/content/attributes/attr[@name="Order Online"]')
from load_xml_file t, table(xmlsequence(extract(t.xml,'/listings/listing'))) x
Thanks!

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How can I extract value based on the specific tag?

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