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

It is a required 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: 30, page 77.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 3.27, page 23.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 31, page 103.

The Resources entry on a page object defines all objects available to the page's content streams. If absent, the page inherits its resources from the nearest ancestor page tree node that supplies a Resources entry.