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- Operation on base-table:
**supported-type?***symbol* Returns

`#t`

if`symbol`names a type allowed as a column value by the implementation, and`#f`

otherwise. At a minimum, an implementation must support the types`integer`

,`ordinal`

,`symbol`

,`string`

, and`boolean`

.

- Operation on base-table:
**supported-key-type?***symbol* Returns

`#t`

if`symbol`names a type allowed as a key value by the implementation, and`#f`

otherwise. At a minimum, an implementation must support the types`ordinal`

, and`symbol`

.

An *ordinal* is an exact positive integer. The other types are
standard Scheme.