— Function: mappl function &rest plists+ ⇒ plist-1
— Function: mapplist function &rest plists+ ⇒ result-list
— Function: mappcon function &rest plists+ ⇒ concatenated-results

These are analogous to mapc, mapcar and mapcan, respectively, but for plists. The difference is that plists are expected and function will receive two arguments for each plist key/value pair: the key and value.