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

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

It contains a TargetElement.

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.

The nested target dictionary extends the traversal to the next level of the embedding hierarchy, allowing navigation through multiple levels of file embedding in one step.