class Meter:
    proj4 = "m"
    ogc_wkt = "Meters" # or is it metre?? sometimes even Meter?
    esri_wkt = "Meter"

class Degree:
    proj4 = "degrees"
    ogc_wkt = "degree"
    esri_wkt = "Degree"

class Feet:
    proj4 = "..."
    ogc_wkt = "Foot_US"
    esri_wkt = "Foot_US"