The SOForeignKey class is accessible via the sqlobject.col module.
<property object at 0xb6ee2b1c>
<property object at 0xb6ee2554>
{<type 'int'>: 'INT', <type 'str'>: 'TEXT'}
<property object at 0xb6e66be4>
Create a list of validators for the column.
See the source for more information.