module revisions-extension {
    namespace "my-namespace";
    prefix pre;

    include submodule-header-extension {
        revision-date 2007-06-09;
    }

    revision "2007-06-09" {
        description "Initial revision.";
    }

    pre:my-extension 1;

    revision "2008-06-09" {
        description "Revision 2.";
    }

    extension my-extension {
        description "my description ...";
        argument "number";
    }

}