Tracks direct property references a document is defining.
A document stores references defined in properties using projectdoc macros by the use of the artificial property named DocumentPropertyRefs.
Phantom References since 2.0
Since version 2.0 of the projectdoc Toolbox this property supports phantom references for transclusions. Property references currently do not support phantom references. This may change in a future version of the projectdoc Toolbox.
The format of the list element values is space-key.page-title:property-name.