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This page is for documenting previous/other attempts at geo related formats, per the microformats process.
GeoJSON is a format for encoding a variety of geographic data structures.
Geography Markup Language (AKA GML) is an XML vocabulary defined by the Open Geospatial Consortium (OGC) to express geographical features.
iCalendar geo property
See hCalendar geo property.
Keyhole Markup Language (AKA KML) is an XML vocabulary for geographic annotation and visualization within 2d maps and 3d Earth browsers.
vCard geo property