A GeoJSON object MAY contain a member named Extensions
which is an extensions object.
An extensions object SHALL contain a set of key/value pairs describing
the extensions in use in that GeoJSON object.
The key is a machine-readable string that names the extension. A key SHOULD have a prefix that names the community responsible for naming the extension. A GeoJSON object SHOULD contain an extensions object to declare which extensions are in use. If a client supports one or more GeoJSON extensions, it SHOULD inspect the extensions object.
The value is a human-readable string describing the extension. A value SHOULD contain a URL for a description of the extension.
{
"type": "FeatureCollection",
"extensions":{
"jyutzler_extension": "A proposed extension for encoding extensions,
as described at https://gist.github.com/jyutzler/da33f075ac416d0445e7"
},
"features": [{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [102.0, 0.5]
},
"properties": {
"prop0": "value0"
}
}]
}