The motivation for this paper arose from a comment by a developer for the open-source game The Battle for Wesnoth [15], who suggested that modifying their scena

The motivation for this paper arose from a comment by a developer for the open-source game The Battle for Wesnoth [15], who suggested that modifying their scenario scripting language to allow a more compact, expressive form would not lead to a reduction in scenario size but instead an in- crease in feature count. </quote>