<?xml version="1.0" encoding="UTF-8"?>
<fkey reftable="products" onupdate="NO_ACTION" ondelete="NO_ACTION">
    <fk_field name="column_namefk1" reffield="column_name1"/>
    <fk_field name="column_namefk2" reffield="column_name2"/>
    <fk_field name="column_namefk3" reffield="column_name3"/>
</fkey>

