# should be caught bu validObject()
# new("person", ga = 40, hgt = new("xyz", y = c(1, 2)))@hgt
#zz <- NULL
#as.POSIXct(ifelse(is.null(zz), NA, zz), format = "%d-%m-%y", tz = "UTC")
# as.POSIXct(ifelse(is.null(zz), NA, zz), format = "%d-%m-%y", tz = "UTC")
# no data
# new("bse", data = new("xyz", x = as.numeric(NA), y = as.numeric(NA)))
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