Site plugin does not properly handle filenames with more than one period

Compare the filenames of the source xdoc to the generated html files, below. Any time there is more than one period (".") in the filename, such as for our release notes pages, the site plugin truncates the filename.

~/svn/struts/current/action
$ mvn site -N
...

$ ls src/site/xdoc/userGuide/

building_controller.xml installation-tc.xml release-notes-1.0.xml
building_model.xml installation-ubs72.xml release-notes-1.1-b1.xml
building_view.xml installation-was352-x.xml release-notes-1.1-b2.xml
configuration.xml installation-was352.xml release-notes-1.1-b3.xml
dev_util.xml installation-wls5.xml release-notes-1.1-rc1.xml
index.xml installation.xml release-notes-1.1-rc2.xml
installation-1.0.xml introduction.xml release-notes-1.1.xml
installation-ip.xml navigation.xml release-notes-1.2.4.xml
installation-ipas.xml preface.xml release-notes-1.2.7.xml
installation-jetty.xml release-notes-1.0-b1.xml release-notes-1.2.8.xml
installation-jr30.xml release-notes-1.0-b2.xml release-notes-1.3.1.xml
installation-novell.xml release-notes-1.0-b3.xml release-notes-1.3.2.xml
installation-oas.xml release-notes-1.0.1.xml release-notes.xml
installation-sas.xml release-notes-1.0.2.xml

$ ls target/site/userGuide

building_controller.html installation-jetty.html installation-wls5.html
building_model.html installation-jr30.html installation.html
building_view.html installation-novell.html introduction.html
configuration.html installation-oas.html navigation.html
dev_util.html installation-sas.html preface.html
index.html installation-tc.html release-notes-1.html
installation-1.html installation-ubs72.html release-notes.html
installation-ip.html installation-was352-x.html
installation-ipas.html installation-was352.html