How to add the multiple lines of xml tags before a particular xml tag in a file

Hi All,

I'm stuck with adding multiple lines(irrespective of line number) to a file before a particular xml tag. Please help me.

<A>testing_Location</A>
<value>LA</value>
<zone>US</zone>

<B>Region</B>
<value>Russia</value>
<zone>Washington</zone>
<C>Country</C>
<value>Canada</value>
<zone>US</zone>

In the above example, my need to add the following line of code above the <zone> tag:

<name>Continent</name>
<value>XXXXXXXXXXXXXXXXXYYYYYYYYYYYYYYYYYYZZZZZZZZZZZZ</value>

The Output should display like:

<A>testing_Location</A>
<value>LA</value>

<zone>US</zone>

<B>Region</B>
<value>Russia</value>

<zone>Washington</zone>
<C>Country</C>
<value>Canada</value>

<zone>US</zone>

Please help me out..