Represents the "TRef" entry of the fdf template dictionary object.

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

It contains a FDFNamedPageReferenceElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 249, page 464.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 252, page 562.

The TRef entry is an FDF named page reference dictionary identifying the template page by name and optionally by file. The viewer spawns a copy of this page into the target document.