@OnDelete, @OnDeleteInverse, @Extends annotations. These annotations cause creation of special meta-annotations for describing relations between entities.

@NamePattern, @SystemLevel, @EnableRestore, @TrackEditScreenHistory annotations. These annotations cause generation of meta-annotations with keys corresponding to the full name of Java class of the annotation.

Optional: custom annotations can be defined in a project, and reflected to corresponding meta-annotations in the overridden MetadataImpl.initMetaAnnotations() method.

Optional: entity meta-annotations can also be defined in metadata.xml files. If a meta-annotation in XML has the same name as the meta-annotation created by Java entity class annotation, then it will override the latter.

<annotations>
    <entity class="com.haulmont.cuba.security.entity.User">
        <annotation name="com.haulmont.cuba.core.entity.annotation.TrackEditScreenHistory" value="false"/>
        <annotation name="com.haulmont.cuba.core.entity.annotation.EnableRestore" value="true"/>
    </entity>
</annotations>