[Google Maps API v3] about the google marks

[abc]

markers : [
                                                                                
{
                                                                                
        id : "near",
                                                                                
        latlng : {
                                                                                
                lat : 0,
                                                                                
                lng : 0,
                                                                                
                alt : {
                                                                                
                        ll : "34786051798312122220",
                                                                                
                        mode : 2
                                                                                
                }
                                                                                
        }

what's the ll means. now format of lat & lng ?

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