EPSG:4373 DEPRECATED

GEOGCRS["RGR92 (3D)",
    DATUM["Reseau Geodesique de la Reunion 1992",
        ELLIPSOID["GRS 1980",6378137,298.257222101,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,3],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["degree minute second hemisphere",0.0174532925199433]],
        AXIS["geodetic longitude (Long)",east,
            ORDER[2],
            ANGLEUNIT["degree minute second hemisphere",0.0174532925199433]],
        AXIS["ellipsoidal height (h)",up,
            ORDER[3],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["Reunion - onshore and offshore - Reunion island, Ile Europa, Bassas da India, Juan de Nova, Iles Glorieuses, and Ile Tromelin."],
        BBOX[-25.92,37.58,-10.6,58.27]],
    ID["EPSG",4373]]

GEOGCS["GCS_RGR92_3D",
    DATUM["D_RGR_1992",
        SPHEROID["GRS_1980",6378137.0,298.257222101]],
    PRIMEM["Greenwich",0.0],
    UNIT["degree minute second hemisphere",0.0174532925199433],
    LINUNIT["Meter",1.0]]

proj4.defs("EPSG:4373","+proj=longlat +ellps=GRS80 +no_defs +type=crs");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "RGR92 (3D)",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Reseau Geodesique de la Reunion 1992",
        "ellipsoid": {
            "name": "GRS 1980",
            "semi_major_axis": 6378137,
            "inverse_flattening": 298.257222101
        }
    },
    "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
            {
                "name": "Geodetic latitude",
                "abbreviation": "Lat",
                "direction": "north",
                "unit": {
                    "type": "AngularUnit",
                    "name": "degree minute second hemisphere",
                    "conversion_factor": 0.0174532925199433
                }
            },
            {
                "name": "Geodetic longitude",
                "abbreviation": "Long",
                "direction": "east",
                "unit": {
                    "type": "AngularUnit",
                    "name": "degree minute second hemisphere",
                    "conversion_factor": 0.0174532925199433
                }
            },
            {
                "name": "Ellipsoidal height",
                "abbreviation": "h",
                "direction": "up",
                "unit": "metre"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Reunion - onshore and offshore - Reunion island, Ile Europa, Bassas da India, Juan de Nova, Iles Glorieuses, and Ile Tromelin.",
    "bbox": {
        "south_latitude": -25.92,
        "west_longitude": 37.58,
        "north_latitude": -10.6,
        "east_longitude": 58.27
    },
    "id": {
        "authority": "EPSG",
        "code": 4373
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs">
	</Layer>
</Map>