Represents the "Properties" entry of the resource dictionary object.

It is an optional entry defined as part of the PDF 1.2 specification.

It contains an Element.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 33, page 84.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 34, page 112.

The Properties entry maps resource names to property list dictionaries. Content streams reference these dictionaries using marked-content operators (BDC, BMC) to associate logical structure or optional content group membership with regions of the page.