...
So....for every relationship use a separate list_ index column. It is a good convention to use the same prefix as use used for the key column. The mapping of grouplayer then looks like this:
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<class name="SharpMap.Layers.GroupLayer, SharpMap" table="grouplayer">
<list name="Layers" lazy="false" cascade="all" collection- type="DeltaShell.Plugins.Data.NHibernate.Collections.Generic.PersistentEventedListType`1[[SharpMap.Layers.ILayer, SharpMap]], DeltaShell.Plugins.Data.NHibernate">
<key column="parent_layer_id"/>
<index column="parent_layer_list_index" />
<one-to-many class="SharpMap.Layers.ILayer, SharpMap"/>
</list>
</class>
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