[#javax-xml-bind-annotation-adapters-XmlJavaTypeAdapter]
= @XmlJavaTypeAdapter (jaxb)

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The JAXB `@XmlJavaTypeAdapter` annotation is used with the framework-provided
`PersistentEntityAdapter` to instruct JAXB to serialize references to persistent entities using the canonical
`OidDto` complex type: the object's type and its identifier.
This is the formal XML equivalent to the `Bookmark`
provided by the xref:refguide:applib:index/services/bookmark/BookmarkService.adoc[BookmarkService].

For example:

[source,java]
----
@XmlJavaTypeAdapter(PersistentEntityAdapter.class)
public class ToDoItem ...  {
    ...
}
----

This annotation therefore allows view models/DTOs to have references to persistent entities; a common idiom.

For a more complete discussion of writing JAXB view models/DTOs, see xref:userguide:ROOT:view-models.adoc[this topic]
in the user guide.

