Haml is a markup language that's used to cleanly and simply describe
the XHTML of any web document without the use of inline code, using
indentation rather than closing tags and allowing Ruby to be embedded
with ease.  Haml functions as a replacement for inline page templating
systems such as PHP, ASP, and ERB, the templating language used in
most Ruby on Rails applications.  However, Haml avoids the need for
explicitly coding XHTML into the template, because it itself is a
description of the XHTML, with some code to generate dynamic content.