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Represents the "Language" entry of the optional content usage
dictionary object.
It is an optional entry defined as part of the PDF 1.0
specification.
It contains an OptionalContentUsageLanguageElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 102,
page 232.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 100, page 285.
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