How to use this pdf2table?

[littlejiao]

Hi,
I cloned this repository into the local. But I don't know how to use it...
I try to download pdf2table.jar, and run it as java -jar pdf2table.jar 2.pdf 2. But I only get a file named as pdf2xml.dtd. Like this:

I really want to know how to get the table extracted from pdf files.

Thanks!!!