Parser settings for files/div/ul/li return nothing

I've been trying to get at the nested file urls in the code below, in order to assign them to attached files for the node:

Using the setting code files/div/ul/li returns nothing in the debug however using files does return the whole content intact.

I'm using the XPath XML Parser and not the XPath HTML - since HTML is XML and my code is a mix of both.

Am I missing some special code to call nested