Currently non-functional WorldGenProperties.json

{
    "additionalPropertyKeys" : ["netherProperties","endProperties"],
    "netherProperties" :
    {
        "minHeight" : 0,
        "maxHeight" : 128,
        "dimensionList" : [-1]
    },
    "endProperties" :
    {
        "minHeight" : 0,
        "maxHeight" : 256,
        "dimensionList" : [1]
    }
}