Ok I've given it a go below. Please let me know if I'm on the right track?
Code:
<sport>
<animals>
<event>Dogs v Cats</event>
<date>12/12/2013</date>
<linkset>
<linktype>bluelinks</linktype>
<links>
<link>http://www.link1.com</link>
<link>http://www.link2.com</link>
<link>http://www.link3.com</link>
</links>
</linkset>
<event>Birds v Ferrets</event>
<date>11/12/2013</date>
<linkset>
<linktype>redlinks</linktype>
<links>
<link>http://www.link4.com</link>
<link>http://www.link5.com</link>
<link>http://www.link6.com</link>
</links>
</linkset>
</animals>
</sport>
What do you think?