my @htmls = qw( ... );
 my @xmls  = qw( ... );
 my @flats = qw( ... );
 my @filters;
 push @filters, map { FilterWebHTML->new($_)  } @htmls;
 push @filters, map { FilterWebXML->new($_)   } @xmls;
 push @filters, map { FilterFlatFile->new($_) } @flats;

 $_->perform_filter() for @filters;