the following somewhat abbreviated mapping work
btw the strategy you described is called "Table per class hierarchy"
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHTest" namespace="NHTest.Model" auto-import="true">
<class name="ApplicationContact" table="contacts">
<id name="Id" column="Id">
<generator class="native" />
</id>
<discriminator type="string" formula="case when PersonName is
not
null then 0 else 1 end" />
<many-to-one name="Application" column="ApplicationId" not-
null="true" />
<subclass name="IndividualContact" discriminator-value="0">
<property name="PersonName" column="PersonName"
not-null="true" />
</subclass>
<subclass name="GroupContact" discriminator-value="1">
<property name="GroupName" column="GroupName"
not-null="true" />
</subclass>
</class>
<class name="Application" table="application">
<id name="Id" column="Id">
<generator class="native" />
</id>
<bag name="Contacts" cascade="all-delete-orphan" inverse="true">
<key column="ApplicationId" />
<one-to-many class="ApplicationContact"/>
</bag>
</class>
</hibernate-mapping>
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