Which version of Unicode does the XERCES-J XML Schema validator support?

Hi Folks,

Michael Kay wrote [1]:

> As far as conformant processors are concerned, the [XML Schema] spec offers 
> implementers freedom to choose which version of Unicode they will 
> support.

Which version of Unicode does the latest version of the XERCES-J XML Schema validator support?

/Roger

[1] http://lists.w3.org/Archives/Public/xmlschema-dev/2011May/0024.html