Is there a command to list all volume classes defined in volutil?

The closest I can find in volutil is to do a "showset xxx classes" and/or
"showvol xxx classes" for every set and/or volume on the system, which can
be tedious on large systems. I think the ideal would be "showclass @
volumes" but wildcards are not supported by showclass in volutil. Is there
another way to do this?

--Jon Diercks
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