more experimenting regarding changed version schema for jdt.core:
some apt-related fragments/packages could not be resolved.
diff --git a/features/org.eclipse.objectteams.otdt.feature/feature.xml b/features/org.eclipse.objectteams.otdt.feature/feature.xml
index dd13252..3be685e 100644
--- a/features/org.eclipse.objectteams.otdt.feature/feature.xml
+++ b/features/org.eclipse.objectteams.otdt.feature/feature.xml
@@ -159,11 +159,11 @@
          install-size="752"
          version="0.0.0"/>
 
-   <plugin
+   <!--plugin
          id="org.eclipse.objectteams.otdt.apt"
          download-size="15"
          install-size="15"
          version="0.0.0"
-         unpack="false"/>
+         unpack="false"/-->
 
 </feature>