don't understand this answer

[J. Kevin Robbins]

Maybe this belongs in Mock Exams Errata, but I'm not sure it's errata, maybe just my lack of knowledge. This is from the JavaRanch mock exam.

(rats, can't figure out how to paste an image)

Anyway, it's question bank id 9, "To map a specific URL to your servlet, which element must be included in your Deployment Descriptor?"

The answer is in the form "<!ELEMENT servlet-mapping (servlet-name, url-pattern)>"

Please explain this format, especially the "<!ELEMENT" part. I've never seen anything like this in all the study materials and it's obviously not an excerpt from a deployment descriptor, so I'm very confused.

[Bear Bibeault]

DTD

[J. Kevin Robbins]

Thanks! A difficult read, but now I understand.