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#{showcase-preamble}
These can be used either in entities or view models.

#{showcase-caveat}#{showcase-note-if-causeway-specific}== How this demo works

On the left hand side is a collection of entities that uses the `#{showcase-simple-type}` datatype.
There is also an action that opens a view model; this view model also uses the `#{showcase-simple-type}` datatype.

Navigate into the entity or view model to see the datatype used as a property, an action parameter and as a return type of collections, along with code samples.

=== Implementation Notes

The entity and view model types both implement some common interfaces:

* The `#{showcase-name}Holder` interface is used to contribute a number of mixins to both types:
+
[source,java]
----
include::holder/#{showcase-name}Holder.java[tags=class]
----

* The `#{showcase-name}Holder2` interface is used to demonstrate support for label positions using `@PropertyLayout(labelPosition=...)`.

Further details, along with the effect of this annotation, can be seen on the entity and view model object pages.
