Represents the "Threads" entry of the catalog dictionary
object.
It is an optional entry defined as part of the PDF 1.1
specification.
It contains an array which contains ThreadElements.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 28,
page 74.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 3.25, page 23.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 29, page 99.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 242,
page 458.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 245, page 555.
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