<type>int unsigned</type>
<comment>FK to Contact ID</comment>
<add>3.3</add>
+ <required>TRUE</required>
</field>
<foreignKey>
<name>contact_id1</name>
<type>int unsigned</type>
<comment>FK to Contact ID</comment>
<add>3.3</add>
+ <required>TRUE</required>
</field>
<foreignKey>
<name>contact_id2</name>