Represents the "ActualText" entry of the structure element dictionary object.

It is an optional entry defined as part of the PDF 1.4 specification.

It contains a string representing a PDF string object.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 323, page 559.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 355, page 722.

The ActualText entry holds the Unicode text the element content represents, used when rendered glyphs do not directly map to the intended text, such as in ligatures or special character substitutions.