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

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a ResourceElement.

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 Resources entry in a page tree node defines inheritable resources for all descendant pages and nodes that do not supply their own Resources entry. This allows common fonts and color spaces to be defined once at the tree level.