Provide definition of Command Message [INT-867]

**[Oleg Zhurakousky](https://jira.spring.io/secure/ViewProfile.jspa?name=oleg.zhurakousky@springsource.com)** opened **[INT-867](https://jira.spring.io/browse/INT-867?redirect=false)** and commented

see http://www.eaipatterns.com/CommandMessage.html


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No further details from [INT-867](https://jira.spring.io/browse/INT-867?redirect=false)