Issue 47: resolution proposal

Issue 47 [1] talks about lack of example/motivation in section 2.1.2. I 
would like to propose that we resolve this issue by adding the following 
at the end of section 2.1.2:

One way this can be achieved is by specifying a callback binding that 
includes endpoint information, on a bidirectional SCA service of a 
component. For example:

<service name="inventory">
   <interface.wsdl interface="..." callbackInterface="..."/>
   <binding.ws/>
   <callback>
     <binding.jms 
uri="jms:inventoryQueue?connectionFactory=inventoryQCF&deliverMode=1&" />
   </callback>
</service>


-Anish
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[1] http://osoa.org/jira/browse/BPEL-47