A couple of interesting DSLs
I love the one by Alan Kay in this article where the programming for the TCP/IP interface is exactly the diagram from the spec:
+-------------+-------------+-------------------------+----------+----------------------------------------+
| 00 01 02 03 | 04 05 06 07 | 08 09 10 11 12 13 14 15 | 16 17 18 | 19 20 21 22 23 24 25 26 27 28 29 30 31 |
+-------------+-------------+-------------------------+----------+----------------------------------------+
| version | headerSize | typeOfService | length |
+-------------+-------------+-------------------------+----------+----------------------------------------+
| identification | flags | offset |
+---------------------------+-------------------------+----------+----------------------------------------+
| timeToLive | protocol | checksum |
+---------------------------+-------------------------+---------------------------------------------------+
| sourceAddress |
+---------------------------------------------------------------------------------------------------------+
| destinationAddress |
+---------------------------------------------------------------------------------------------------------+
