<maplink> and/or <mapframe>: Normally show parameter gets a comma-separated list of marker groups specifying which markers should be presented on a map. The group lists could be large. Therefore I propose an additional syntax with an all parameter:
- show = "all" // presenting all markers named in an article
- show = "all,-mask" // presenting all markers named in an article excluding the mask group
- show = "all,nearby" // presenting all markers named in an article and markers for nearby articles (Wikimedia feature)
Even in case that "nearby" is not interpreted by maplink/mapframe directly it is used to activate an additional map layer.
This task was mentioned at Community-Wishlist-Survey-2017 (https://meta.wikimedia.org/wiki/2017_Community_Wishlist_Survey/Miscellaneous/Kartographer_improvements), which got the No.1 out of 214 proposals.