LOL

These web pages are built using a custom markup language, LOL.[Lots of luck!] LOL is an XML tag language, validated with a combination of a RelaxNG schema, and a custom stylesheet. A web site is generated from LOL source using XSLT. Hyperlinks in this web site are managed through LOL tagging. We are also developing other features into the language, such as managing the structures in our formal specs. If this makes sense to you, LOL may be of some interest. If not, you've probably already read more than you need to.

The LOL tag menagerie
is just a document with all kinds of examples (pathological and not) of LOL tagging, including mixtures of XHTML etc. It doesn't look like much unless you look at the source code.
The LOL tag library
isn't really ready yet either

LOL, what it is

An augmentation of XHTML that provides a hypertext superstructure, as well as other useful facilities....