my %MasterType = (
   'TEXT'   => {
      'function'        => \&run_default,
      'command'         => 'SIIA',
      'linkedHeaders'   => {
         'r#'    => 'INO',
         'rf'    => 'IS1',
         'rt'    => 'ITE',
      },
   },
);

##</code><code>##

&{%MasterType->{'TEXT'}->{'function'}}(
   %MasterType->{'TEXT'}->{'command'},
   %MasterType->{'TEXT'}->{'linkedHeaders'}
);