Reference to display form to use for element representations.
The display form can be referenced by either URL of the display form resource on backend OR by unique, backend-recognized, identifier of the display form.
Note: specifying display forms by URI is discouraged and WILL be deprecated in the future. The specification of URL has several drawbacks:
- Display form URLs are tied to particular analytical workspace; this makes any application that uses URL-specified display forms workspace-specific. - Display form URLs are not supported by all GoodData backends == this makes any application that uses URL-specified display form backend-specific