Represents the "Parent" entry of the dpart dictionary object.

It is a required entry defined as part of the PDF 2.0 specification.

It contains a DocumentPartElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 409, page 829.

The Parent entry references the parent document part node. Processors traverse parent links to determine the context of a document part within the larger hierarchy.