foreignkey
If this is a child table, this key will match against the primary key of the parent table. This key is not needed for parent tables.
<table>
<foreignkey>fk_person</foreignkey>
Multiple values are not supported for the foreign key. If the primary key has multiple keys, the match will be against the first key. Use Ruby for these advanced scenarios. All primary keys come into the Ruby View in the params hash. Then use method ‘table’ to fetch the data for the child table.
Use lowercase when possible