Parser possibilities: Why write a markup parser?

Norman Smith - Science Applications International Corporation - Paper

Markup Parser: A parser that handles SGML, ML, WordML, etc transparently.

It is a non-validating parser

Reasons not to write a parser: it is a lot of work, validating parsers are even more work.

Reasons to write one: use multiple meta-languages. Learning experience both of the markup language and maybe a programming language.