Common code for XML projects

xml-commons is focused on common code and guidelines for xml projects.
It's first focus will be to organize and have common packaging for the
various externally-defined standards code relating to XML - things like
the DOM, SAX, and JAXP interfaces.
As the xml-commons community forms, we also hope to serve as a holding
area for other common xml-related utilities and code, and to help
promulgate common packaging, testing, documentation, and other
guidelines across all xml.apache.org subprojects.