Represents the "LE" entry of the line annotation object.
It is an optional entry defined as part of the PDF 1.4
It contains an array which contains strings, representing PDF
Items in this array may take one of the following valid
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 175,
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 178, page 482.