Note: updated syntax example for you to play with

Attribute symbol: &
Singleton symbol: |
Definition symbol: <
Literal symbol: :
Ordered instance (array index) symbol: #

=markus|&+email/$ref/
   =markus&+email!9876
=markus+home|&+email/$ref/
   =markus&+email!5432
=markus+work|&+email/$ref/
   =markus&+email!9876
=markus&+email!5432:/:/
   ""
=markus&+email!9876:/:/
   ""
=markus&+email!9876|&$t:/:/
   "2013-04-11T10:11:12Z"
=markus+address!4567&+street#1:/:/
   "123 Main St"
=markus+address!4567&+street#2:/:/
   "Apt 23"
=markus+address!4567|&+city:/:/
   "Vienna"
=markus+address!4567|&+country:/:/
   "Austria"
=markus+address!4567|&$t:/:/
   "2013-04-11T10:11:12Z"
<&+email/$is+/
   $string
<@example<&+email&$xbnf#1:/:/
   "1*DIGIT '@example.com'"