I tried to add <discriminator> : <?xml version=1.0 encoding=utf-8 ?> <hibernate-mapping xmlns=urn:nhibernate-mapping-2.2 assembly=X namespace=X.y>

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Asked: May 27, 20262026-05-27T05:42:41+00:00 2026-05-27T05:42:41+00:00

I tried to add <discriminator> : <?xml version=1.0 encoding=utf-8 ?> <hibernate-mapping xmlns=urn:nhibernate-mapping-2.2 assembly=X namespace=X.y>

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I tried to add <discriminator>:

    <?xml version="1.0" encoding="utf-8" ?>
    <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="X" namespace="X.y">
     <class name="RawAttachment" table="Metadata_Attachment">
        <id name="AttachmentId">
          <generator class="guid" />
        </id>
        <discriminator column="PAYMENT_TYPE" type="String"/> 
  <subclass
    name="Attachment"
    discriminator-value="Cash">
     <property name="LocationId"/>
   </subclass>

but got the following error:

The element ‘class’ in namespace ‘urn:nhibernate-mapping-2.2’ has
invalid child element ‘discriminator’ in namespace
‘urn:nhibernate-mapping-2.2’. List of possible elements expected:
‘property, many-to-one, one-to-one, component, dynamic-component,
properties, any, map, set, list, bag, idbag, array, primitive-array,
join, subclass, joined-subclass, union-subclass, loader, sql-insert,
sql-update, sql-delete, filter, resultset, query, sql-query’ in
namespace ‘urn:nhibernate-mapping-2.2’.

why?