List of spaces to delegate documents on creation to. Also works as a search space for upstream spaces.
This property allows to specify the default space closure to use for macros in this space.
Currently this property is only used by the Wiki Link Macro. Since the default value for this property is Delegate Space, the behavior is backwards compatible with versions prior to 3.1.
The main use case for this is the use of index spaces. Index spaces typically link to the Search Space instead of the delegate-space.