project property
Project is the project scope the underlying document was saved under. Absent for a document saved with none, and for the synthetic nodes — unresolved link targets and connectors belong to no project. When ?project= narrows the graph, every page, memory and source node carries that value.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? project;