Trying to see if number in XML is descending

Hello,

There is a node value within the XML data that is supposed to be going in the descending number order and I'm trying to validate that. Unfortunately I'm not knowledgeable with Groovy nor Javascript, only a little about PHP.

So we have
<Lists>
<List>
<Point>100<Point>
<List>
<List>
<Point>20<Point>
<List>
<Lists>

Would be amazing if anyone can show me the right resources to validate if the <Point> node values are going to a descending order? The soapUI pro was able to create assertion for content and count, but this is not exactly what I need.

Thank you so much in advance for any tips and advices.