XAML is a perfect example: "When used in Windows Workflow Foundation contexts, XAML is used to describe potentially long-running declarative logic, such as tho

XAML is a perfect example: "When used in Windows Workflow Foundation contexts, XAML is used to describe potentially long-running declarative logic, such as those created by process modeling tools and rules systems." http://en.wikipedia.org/wiki/Extensible_Application_Markup_Language http://en.wikipedia.org/wiki/Extensible_Application_Markup_L... PS: it is of course also used for modern GUI mark-up.