LayoutConstants

Constant identifiers of the layout.xml that are commonly used in layouts.

All of the mixins provided by the framework are bound to the FieldSetId#METADATA metadata field set, and so - unless explicitly specified in the object’s layout to some other location, will expect that the layout includes a field set with this id.

The service that loads layouts is org.apache.causeway.applib.services.grid.GridSystemService , and the framework’s default implementation of this service supports the notion of a fallback layout, used whenever an object has no associated layout file. This fallback layout does expose a FieldSetId#METADATA metadata fieldset. (The fallback layout itself can be found in the GridFallbackLayout.xml file).