This category is populated by {{Attached KML}} (via Module:Attached KML) when the KML file is found through Wikidata. Either the article's item on Wikidata has an appropriate KML档案 (P3096) statement, or the |wikidata= parameter is specified (with an item id (Q-number) that has an 隶属于 (P31)→维基媒体锁眼标记语言档 (Q26267864) statement).