# non-standard formatting #########################################################################
# always put footer at the end (assuming order does not matter?)
body( header   => sub { hgroup(  sub { }); },
      contents => sub { article( header   => sub { },
                                 contents => sub { section( header   => sub { },
                                                            contents => sub { aside( header   => sub { },
                                                                                     contents => sub { }, 
                                                                                     footer   => sub { }, ); }, 
                                                            footer   => sub { }, );
                                                   section( header   => sub { },
                                                            contents => sub { }, 
                                                            footer   => sub { }, );
                                                   aside(   header   => sub { },
                                                            contents => sub { }, 
                                                            footer   => sub { }, ); }, 
                                 footer   => sub { }, ); }, 
      footer   => sub { address( sub { }); }, );


# alternative #####################################################################################
# remaining super-structure
body( header   => sub { hgroup(  sub { }); },
      contents => sub { article( header   => sub { },
                                 contents => \&contents1,
                                 footer   => sub { }, ); },
      footer   => sub { address( sub { }); }, );

# delegated content
sub contents1 { section( header   => sub { },
                         contents => sub { aside( header   => sub { },
                                                  contents => sub { },
                                                  footer   => sub { }, ); },
                         footer   => sub { }, );
                section( header   => sub { },
                         contents => sub { },
                         footer   => sub { }, );
                aside(   header   => sub { },
                         contents => sub { },
                         footer   => sub { }, ); }