This case-sensitive code system http://hl7.org/fhir/questionnaire-usage-mode defines the following codes:

Code	Display	Definition
capture-display	Capture & Display	Render the item regardless of usage mode.
capture	Capture Only	Render the item only when capturing data.
display	Display Only	Render the item only when displaying a completed form.
display-non-empty	Display when Answered	Render the item only when displaying a completed form and the item has been answered (or has child items that have been answered).
capture-display-non-empty	Capture or, if answered, Display	Render the item when capturing data or when displaying a completed form and the item has been answered (or has child items that have been answered).