I tried to enable the "flat" modello format for collections, to change :
<plugin>
<executions>
<execution>
<id>xx</id>
<phase>xx</phase>
<goals>
<goal>xx</goal>
</goals>
</execution>
</executions>
</plugin>
.. to the more convice :
<plugin>
<execution id="xx" phase="xx">
<goal>xx</goal>
</executions>
</plugin>
but this didn't worked : the modello generated parser still search the "executions" in XML stream. Not investigated more yet on this.
see build: http://people.apache.org/~brett/apache-maven-2.0.9-SNAPSHOT-terse-bin.tar.gz
and branch: http://svn.apache.org/repos/asf/maven/components/branches/maven-2.0.x-terse