The short answer is that it is rather difficult in SAS 9.1, but will get better in SAS 9.2.
Can you provide more details on this project? How do you normally execute Web Services now? That is, what Web Service client framework do you currently use (e.g., Axis, JWSDP). Do you use Java or some other language? Do you have a pointer to a sample Web Service that you would like to execute from with in a stored process? If not, can you tell us what the expected inputs/outputs are?
Vince DelGobbo
SAS R&D