[Interest] Extract only src attribute of an image tag into XmlRole with XPath functions

[Gian Maxera]

Hello,
I have an rss feed coming from Tumblr blog page.
The xml of the feed has into description a lot of html content that I want to 
remove and keep only the first image I found.
For example, this is one of the content into description tag:

<description>&lt;img 
src="http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif
 
<http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif>"/&gt;&lt;br/&gt;
 &lt;br/&gt;&lt;img 
src="http://33.media.tumblr.com/6f1ca4ab1ef3d2504b2da48f2616df6e/tumblr_np213siZRu1tbs1mwo2_400.gif
 
<http://33.media.tumblr.com/6f1ca4ab1ef3d2504b2da48f2616df6e/tumblr_np213siZRu1tbs1mwo2_400.gif>"/&gt;&lt;br/&gt;
 Paris Marriott Champs Elysees&lt;br/&gt;&lt;br/&gt; &lt;img 
src="http://36.media.tumblr.com/0f4726dd2f19c8d4a042f72786987573/tumblr_np213siZRu1tbs1mwo3_500.jpg
 
<http://36.media.tumblr.com/0f4726dd2f19c8d4a042f72786987573/tumblr_np213siZRu1tbs1mwo3_500.jpg>"/&gt;&lt;br/&gt;
 &lt;br/&gt;&lt;h2&gt;&lt;b&gt;Marriott Hotels in France Celebrate Earth Hour 
2015&lt;/b&gt;&lt;/h2&gt;&lt;p&gt;See what happened during Earth Hour 
celebrations at Marriott hotels in France.&lt;/p&gt;</description>

What I would like is to have a XPath function that return me only the first 
image url:
http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif
 
<http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif>

How can I do that ?

Thanks,
Gianluca.
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