Rewrote Section 6 according to the latest decisions: 1. Use 'unsequenced' to specify vector policy 2. Add examples 3. Have only one vector policy (no par_vec/seq_vec). The rest of the document still needs to be changed.
Rewrote Section 6 according to the latest decisions:
1. Use 'unsequenced' to specify vector policy
2. Add examples
3. Have only one vector policy (no par_vec/seq_vec).
The rest of the document still needs to be changed.

n3554/n3554,n3554/n3554,n3554/n3554