Multiple Column Table Reference
<Biml xmlns="http://schemas.varigence.com/biml.xsd">
<Tables>
<!-- MultipleColumnTableReference: Columns must be part of the table's unique or primary key.
Use MultipleColumnTableReferenceGroupName to group a set of columns into a single foreign key-->
<Table Name="SampleChild" ConnectionName="TableConnection">
<Columns>
<MultipleColumnTableReference Name="Column1" ForeignColumnName="SampleParent.Column1" MultipleColumnTableReferenceGroupName="FK_MyForeignKey" />
<MultipleColumnTableReference Name="Column2" ForeignColumnName="SampleParent.Column2" MultipleColumnTableReferenceGroupName="FK_MyForeignKey" />
</Columns>
</Table>
</Tables>
</Biml>