def valid?
      return false if @name.nil?
      acl_validator = EnumAttributeValidator.new('String', ["public", "private"])
      return false unless acl_validator.valid?(@acl)
      return true
    end
def valid?
      return false if @name.nil?
      acl_validator = EnumAttributeValidator.new('String', ["public", "private"])
      return false unless acl_validator.valid?(@acl)
      return true
    end
Check to see if the all the properties in the model are valid
 @return true if the model is valid