+(defun find-attribute (description attribute-name)
+ (find attribute-name (description-attributes description)
+ :key #'attribute-name))
+
+(define-layered-function description-active-descriptions (description)
+ (:method ((description standard-description-object))
+ (attribute-value (find-attribute description 'active-descriptions)))
+ (:method ((description attribute))
+ (attribute-active-descriptions description)))
+
+(define-layered-function description-inactive-descriptions (description)
+ (:method ((description standard-description-object))
+ (attribute-value (find-attribute description 'inactive-descriptions)))
+ (:method ((description attribute))
+ (attribute-inactive-descriptions description)))