I downloaded the source for 2.5.6 and was looking at it.
It appears that the build.xml doesn't create a ZIP file of the source code.
Having a source zipe would be advantageous for debugging within ECLIPSE
for "stepping into spring library source code", or learning the secrets
of the spring source code.
I suggest to add the following target to build.xml for the next release.
(and side question: shouldn't the spring.jar file be named spring.2.5.6.jar
and so the src zip file should be src.spring.2.5.6.zip ??)
<target name="srczip" description="builds a ZIP file of ALL source code for spring.jar">
<echo message="Creating src.spring.zip file"/>
<!-- make folder for output ZIP file if folder not present -->