It's no longer useful. The SEC used to require an EX-27 schedule in SGML with useful data. They discontinued that around 2001. Years later, they started requiring that data in XBRL format, which is more detailed. You could do this today with XBRL tools, which are available.

Downside was written in Perl, in 1999. There's a system in there to parse financial statements written in HTML for humans, but it's for HTML 3.1 and was never updated.

I used to get hate mail from CFOs over this.