xalan library conflict in XWiki integration environment

While working with XE2.1.1 I have experienced a blocking library conflict for the xalan xml processing library, version 2.5.1 which is currently bundled in XE.

As far as I remember, while working with XE2.2 I had experienced the same issue.
The problem appears when adding some Scribo annotators into the classpath, thus determining UIMA to process the UIMA xml descriptors.

As a workaround, it seems that xalan-2.7.1 with the added dependency of serializer-2.7.1 fixes the problem.
The right fix for this problem would be an update on the XWiki side.