garyrussell/spring-integration — comment on commit e9fd374f731031f94c4005b653ecbed00f788af9
File: docs/src/reference/docbook/configuration.xml line 33
By garyrussell:

I am less concerned about core spring schemas - you can run Spring 3.1 with a 3.0 schema declaration, but you can't run SI 2.1 with a 2.0 declaration...

https://jira.springsource.org/browse/INT-2157

...and the 2.1 reference manual had 2.0 schemas.