This section is represented by <realms><realm> element
<realm>
<id>realm://RedHat/DB</id>
<repository-id-ref>RedHat Repository DB</repository-id-ref>
<identity-type-mappings>
<identity-mapping>IDENTITY</identity-mapping>
</identity-type-mappings>
</realm>
<realm> element contains:
id - realm id
repository-id-ref - id of configured IdentityStoreRepository
identity-type-mappings
identity-mapping - name of IdentityObjectType that should be maped as Identity object on the API side