use XML::LibXML 2.00;

my $dom    = XML::LibXML->load_xml(IO => \*DATA);
my $answer = $dom->getElementsByTagName('answer')->get_node(1);

$answer->parentNode->removeChild($answer);
print $dom;

__DATA__
<xml>
	<answer>
		<url>http:....</url>
		<content>value 1</content>
	</answer>
	<answer>
		<url>http:....</url>
		<content>value 2</content>
	</answer>
</xml>