Represents the "Parent" entry of the page tree node object.

It is defined as part of the PDF 1.0 specification.

It contains a PageTreeNodeElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 29, page 76.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 30, page 102.

The Parent entry references the parent page tree node of this node. Every node except the root must have a Parent entry. The root node's Parent entry is absent.

Readers use the Parent chain to traverse upward from a page or node to find inherited attributes such as Resources, MediaBox, and Rotate.