Add a developer-tool to pretty-print the XMLs in an OOXML file. This makes it easier to compare OOXML files produced by different applications with differeing XML formatting.
poi/trunk/src/ooxml/java/org/apache/poi/dev/OOXMLLister.java
poi/trunk/src/ooxml/java/org/apache/poi/dev/OOXMLPrettyPrint.java