Tracks direct transclusions a document is defining.
A page using the Transclusion Macro stores the information about which documents it is transcluding from by the use of the artificial property named TranscludedDocumentTitles.
Phantom References since 2.0
Since version 2.0 of the projectdoc Toolbox this property supports phantom references. A phantom reference is a reference declared to transclude from a page, but without the requirement for the existence of the document or the referenced document fragment Prior to that version only documents have been listed where content was actually transcluded.
The format of the values is space-key.page-title.