Represents the "R" entry of the target dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF name object.

This item may take one of the following valid values:.

• P
• C

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 202, page 420.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 205, page 510.