{
idx => 'su-to',
label => 'Topics',
tags => [ qw/ 600a 601a 602a 603a 604a 605a 606ax 610a/ ],
tags => [ qw/ 600ab 601ab 602a 604at 605a 606ax 610a / ],
sep => ' - ',
},
idx => 'su-geo',
label => 'Places',
tags => [ qw/ 651a / ],
tags => [ qw/ 607a / ],
idx => 'su-ut',
label => 'Titles',
tags => [ qw/ 500a 501a 502a 503a 504a / ],
tags => [ qw/ 500a 501a 503a / ],
sep => ', ',
-