I have been trying to figure out if it is possible, and how it would work, to use the URL filter query to search through the 'Categories' element in DataEntries within a DataFeed. If this is not possible then is there another way to gather certain DataEntries based on the 'Categories' element? Also, What is the main purpose and function of the 'Categories' element?
Aaron: "You know that story, about how NASA spent millions of dollars developing this pen that writes in Zero G? Did you ever read that?"
Abe: "Yeah."
Aaron: "You know how the Russians solved the problem?"
Abe: "Yeah, they used a pencil."
Aaron: "Right. A normal wooden pencil. It just seems like Philip takes the NASA route almost every time."
--Primer (2004)