[2] (2017-01-10 14:01:06 +09:00) https://www.iana.org/assignments/media-types/application/gml+xml

[1] Geography Markup Language - Wikipedia, the free encyclopedia (2016-10-01 17:13:22 +09:00) https://en.wikipedia.org/wiki/Geography_Markup_Language

[3] Geography Markup Language | OGC (2019-06-09 15:18:17 +09:00) http://www.opengeospatial.org/standards/gml

[4] ISO 19136