Regarding industry standard rotation conventions: See IPC-D-355, "Printed 
Board Automated Assembly Description in Digital Form," Appendix B.

If IPC-D-350 (stop smirking) is used as a data transfer format, the pin 
orientation may be accounted for during design.

This is based on Mitron's GENCAD 1.3 specification which is going to
be the standard for DTS96, a new data transfer format.

For more info on IPC-D-356 or DTS96, contact task group chair Harry 
Parkinson at Digital Equipment Corp. ([log in to unmask]).

Mike Buetow
IPC Technical Staff
2215 Sanders Road
Northbrook, IL 60062
P: 847-509-9700, ext. 335
F: 847-509-9798
[log in to unmask]