Random xml text output

Hi does anyone know how to output a random xml node, for example:

<greeting>

<greet>Happy Christmas</greet>
<greet>Happy New Year</greet>
<greet>Hi from the team</greet>

</greeting>

Basically a random message would be displayed in the scene and shown when called, for example an animation will play, and a message will be shown, the next time the animation is show the message is shown again, only this time different.

Any ideas or approaches, in a simple learning curve way for the quick addition?

Any advice, direction examples better still would be perfect.

Many thanks