Represents the "H" entry of the link annotation object.

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

It contains a string representing a PDF name object.

The PDF specification states that this item assumes a value of "I" if no value has been provided.

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

• N
• I
• O
• P

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 173, page 395.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 176, page 479.