PL declarative UI layout evolution

[RobertShiplett]

If you like PL evolution, this is the red programming language emerging from the rebol tradition - Red GTK

or this YouTube link SoftwareFreedomDay.

note: rebol is also an expression-based language for the web (and for text, is packrat-parser equivalent - although for text parsing I prefer the Object Icon variant of another expression-based language: ICON/Unicon )