+ <reference bind="addUiProvider" cardinality="0..n" interface="org.argeo.cms.ui.CmsUiProvider" name="CmsUiProvider" policy="dynamic" unbind="removeUiProvider"/>
+ <reference bind="addTheme" cardinality="1..n" interface="org.argeo.api.cms.CmsTheme" name="CmsTheme" policy="dynamic" unbind="removeTheme"/>