Issue 47: Section 2.1.2 (initializePartnerRole) needs an example

This is a new issue based on a PR comment, per my AI.
http://osoa.org/jira/browse/BPEL-47

PR 01 comment filed at:
http://lists.oasis-open.org/archives/sca-bpel-comment/200906/msg00000.html

It is hard to understand the motivation and utility behind Section 2.1.2
without an example. An example such as binding.jms where the callback
address is specified in the composite would help.