The directory field is essentially the same as the file field except it the selection is limited to directories only, not single files.
The directory supports the following two special attributes for the <spec> element:
mustExist - optional (default: true) Specifies whether or not the selected path must be an existing directory.
create - optional (default: false) Specifies whether or not the selected directory should be created if it does not exist (requires mustExist=true).
Messages for the directory field can be customized by creating a custom lang pack and overriding the following values (attribute values wrapped for readability):
Note: Mixing directory fields with other fields that have text in front of them can lead to formatting (layout) issues. Placing these types of elements on different panels can provide a much better user experience.