ABYSML

"ABYSML is a markup language that puts comprehensibility of the input text above convenience for the language processor. In this respect it is very different from XML, which is both dreadfully difficult to read, and yet a tremendous pain in the ass to parse; XML brings to mind H.L. Mencken's concept of "the libido for the ugly". Well, ABYSML is beautiful and simple and I guarantee you won't give old H.L. a second thought."

Example of the code:
BIF:
NETWORK
{
NAME: Dog-Problem
VARIABLE
{
NAME: light-on
OUTCOME: true
OUTCOME: false
PROPERTY: 'position = (73, 165)'
}
...

(Available from the RISO site).