-- * PRECEDING MEANS A MUST, Oh preceding mean its optional

-- / preceding means it is a derived variable - computed from other values

-- e.g age is computed from the date of birth

-- multivalues are postfixed with [0..n] meaning a person can have several talents

-- not just one.

* name.first 

* name.last

o email address

o shipping address

o date of birth

/ age {read only}

o talents [0..n]