...
There has been some recent activity in XML Commons External, with a few bug fixes to StreamResult applied to all of the branches. A release of the JAXP 1.4 APIs is expected before the end of the year to support the upcoming Xerces-J 2.10.0 release.
General
The XML project wondered if Xerces would be interested in taking Crimson for a sub-project. We passed on that. Given its years of inactivity, Crimson is more likely suitable for the Attic.